We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Audiências Públicas sem possibilidade de Edição
Ao criar uma Audiência Pública e salva-la, não aparecem os metadados da matéria legislativa inseridas no preenchimento. 
Ao clicar em Editar, só  aparece o título da audiência criada.
grato

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `sapl/audiencia/views.py`
Content:
```
1 from django.http import HttpResponse
2 from django.views.decorators.clickjacking import xframe_options_exempt
3 from django.views.generic import UpdateView
4 from sapl.crud.base import RP_DETAIL, RP_LIST, Crud
5 
6 from .forms import AudienciaForm
7 from .models import AudienciaPublica
8 
9 
10 def index(request):
11     return HttpResponse("Audiência  Pública")
12 
13 
14 class AudienciaCrud(Crud):
15     model = AudienciaPublica
16     public = [RP_LIST, RP_DETAIL, ]
17 
18     class BaseMixin(Crud.BaseMixin):
19         list_field_names = ['numero', 'nome', 'tipo', 'materia',
20                             'data']
21         ordering = 'nome', 'numero', 'tipo', 'data'
22 
23     class ListView(Crud.ListView):
24         paginate_by = 10
25 
26     class CreateView(Crud.CreateView):
27         form_class = AudienciaForm
28 
29         def form_valid(self, form):
30             return super(Crud.CreateView, self).form_valid(form)
31 
32     class UpdateView(Crud.UpdateView):
33         form_class = AudienciaForm
34 
35         def get_initial(self):
36             initial = super(UpdateView, self).get_initial()
37             initial['tipo_materia'] = self.object.materia.tipo.id
38             initial['numero_materia'] = self.object.materia.numero
39             initial['ano_materia'] = self.object.materia.ano
40             return initial
41      
42     class DeleteView(Crud.DeleteView):
43         pass
44 
45     class DetailView(Crud.DetailView):
46 
47         layout_key = 'AudienciaPublicaDetail'
48 
49         @xframe_options_exempt
50         def get(self, request, *args, **kwargs):
51             return super().get(request, *args, **kwargs)
52 
53
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/sapl/audiencia/views.py b/sapl/audiencia/views.py
--- a/sapl/audiencia/views.py
+++ b/sapl/audiencia/views.py
@@ -34,9 +34,10 @@
 
         def get_initial(self):
             initial = super(UpdateView, self).get_initial()
-            initial['tipo_materia'] = self.object.materia.tipo.id
-            initial['numero_materia'] = self.object.materia.numero
-            initial['ano_materia'] = self.object.materia.ano
+            if self.object.materia:
+                initial['tipo_materia'] = self.object.materia.tipo.id
+                initial['numero_materia'] = self.object.materia.numero
+                initial['ano_materia'] = self.object.materia.ano
             return initial
      
     class DeleteView(Crud.DeleteView):

{"golden_diff": "diff --git a/sapl/audiencia/views.py b/sapl/audiencia/views.py\n--- a/sapl/audiencia/views.py\n+++ b/sapl/audiencia/views.py\n@@ -34,9 +34,10 @@\n \n         def get_initial(self):\n             initial = super(UpdateView, self).get_initial()\n-            initial['tipo_materia'] = self.object.materia.tipo.id\n-            initial['numero_materia'] = self.object.materia.numero\n-            initial['ano_materia'] = self.object.materia.ano\n+            if self.object.materia:\n+                initial['tipo_materia'] = self.object.materia.tipo.id\n+                initial['numero_materia'] = self.object.materia.numero\n+                initial['ano_materia'] = self.object.materia.ano\n             return initial\n      \n     class DeleteView(Crud.DeleteView):\n", "issue": "Audi\u00eancias P\u00fablicas sem possibilidade de Edi\u00e7\u00e3o\nAo criar uma Audi\u00eancia P\u00fablica e salva-la, n\u00e3o aparecem os metadados da mat\u00e9ria legislativa inseridas no preenchimento. \r\nAo clicar em Editar, s\u00f3  aparece o t\u00edtulo da audi\u00eancia criada.\r\ngrato\n", "before_files": [{"content": "from django.http import HttpResponse\nfrom django.views.decorators.clickjacking import xframe_options_exempt\nfrom django.views.generic import UpdateView\nfrom sapl.crud.base import RP_DETAIL, RP_LIST, Crud\n\nfrom .forms import AudienciaForm\nfrom .models import AudienciaPublica\n\n\ndef index(request):\n    return HttpResponse(\"Audi\u00eancia  P\u00fablica\")\n\n\nclass AudienciaCrud(Crud):\n    model = AudienciaPublica\n    public = [RP_LIST, RP_DETAIL, ]\n\n    class BaseMixin(Crud.BaseMixin):\n        list_field_names = ['numero', 'nome', 'tipo', 'materia',\n                            'data']\n        ordering = 'nome', 'numero', 'tipo', 'data'\n\n    class ListView(Crud.ListView):\n        paginate_by = 10\n\n    class CreateView(Crud.CreateView):\n        form_class = AudienciaForm\n\n        def form_valid(self, form):\n            return super(Crud.CreateView, self).form_valid(form)\n\n    class UpdateView(Crud.UpdateView):\n        form_class = AudienciaForm\n\n        def get_initial(self):\n            initial = super(UpdateView, self).get_initial()\n            initial['tipo_materia'] = self.object.materia.tipo.id\n            initial['numero_materia'] = self.object.materia.numero\n            initial['ano_materia'] = self.object.materia.ano\n            return initial\n     \n    class DeleteView(Crud.DeleteView):\n        pass\n\n    class DetailView(Crud.DetailView):\n\n        layout_key = 'AudienciaPublicaDetail'\n\n        @xframe_options_exempt\n        def get(self, request, *args, **kwargs):\n            return super().get(request, *args, **kwargs)\n\n    ", "path": "sapl/audiencia/views.py"}], "after_files": [{"content": "from django.http import HttpResponse\nfrom django.views.decorators.clickjacking import xframe_options_exempt\nfrom django.views.generic import UpdateView\nfrom sapl.crud.base import RP_DETAIL, RP_LIST, Crud\n\nfrom .forms import AudienciaForm\nfrom .models import AudienciaPublica\n\n\ndef index(request):\n    return HttpResponse(\"Audi\u00eancia  P\u00fablica\")\n\n\nclass AudienciaCrud(Crud):\n    model = AudienciaPublica\n    public = [RP_LIST, RP_DETAIL, ]\n\n    class BaseMixin(Crud.BaseMixin):\n        list_field_names = ['numero', 'nome', 'tipo', 'materia',\n                            'data']\n        ordering = 'nome', 'numero', 'tipo', 'data'\n\n    class ListView(Crud.ListView):\n        paginate_by = 10\n\n    class CreateView(Crud.CreateView):\n        form_class = AudienciaForm\n\n        def form_valid(self, form):\n            return super(Crud.CreateView, self).form_valid(form)\n\n    class UpdateView(Crud.UpdateView):\n        form_class = AudienciaForm\n\n        def get_initial(self):\n            initial = super(UpdateView, self).get_initial()\n            if self.object.materia:\n                initial['tipo_materia'] = self.object.materia.tipo.id\n                initial['numero_materia'] = self.object.materia.numero\n                initial['ano_materia'] = self.object.materia.ano\n            return initial\n     \n    class DeleteView(Crud.DeleteView):\n        pass\n\n    class DetailView(Crud.DetailView):\n\n        layout_key = 'AudienciaPublicaDetail'\n\n        @xframe_options_exempt\n        def get(self, request, *args, **kwargs):\n            return super().get(request, *args, **kwargs)\n\n    ", "path": "sapl/audiencia/views.py"}]}