message: [WIP] fix user specified JSON metadata not updating dashboard on refresh
diff: @@ -633,8 +633,9 @@ class DashboardModelView(SupersetModelView, DeleteMixin): # noqa
  }
  def pre_add(self, obj):
  - obj.slug = obj.slug.strip() or None
  + obj.slug = obj.slug or None
  if obj.slug:
  + obj.slug = obj.slug.strip()
  obj.slug = obj.slug.replace(' ', '-')
  obj.slug = re.sub(r'[^\w\-]+', '', obj.slug)
  if g.user not in obj.owners:
  