Fix SparseGAState class

demo/mast3r_demo.py

@@ -43,12 +43,10 @@ class SparseGAState():
         self.outfile_name = outfile_name
 
     def __del__(self):
-        if self.cache_dir is not None and os.path.isdir(self.cache_dir):
+        if hasattr(self, 'cache_dir') and self.cache_dir is not None and os.path.isdir(self.cache_dir):
             shutil.rmtree(self.cache_dir)
-        self.cache_dir = None
-        if self.outfile_name is not None and os.path.isfile(self.outfile_name):
+        if hasattr(self, 'outfile_name') and self.outfile_name is not None and os.path.isfile(self.outfile_name):
             os.remove(self.outfile_name)
-        self.outfile_name = None
 
 
 def get_args_parser():