Remove remaining usage of lists for extra_column.

mayan/apps/documents/views.py

@@ -556,12 +556,12 @@ def document_download(request, document_id=None, document_id_list=None, document
                 'hide_links': True,
                 'scrollable_content': True,
                 'scrollable_content_height': '200px',
-                'extra_columns': [
+                'extra_columns': (
                     {'name': _('Document'), 'attribute': 'document'},
                     {'name': _('Date and time'), 'attribute': 'timestamp'},
                     {'name': _('MIME type'), 'attribute': 'mimetype'},
                     {'name': _('Encoding'), 'attribute': 'encoding'},
-                ],
+                ),
             }
         }
     )

mayan/apps/dynamic_search/views.py

@@ -27,12 +27,12 @@ class ResultsView(SingleObjectListView):
 
         if setting_show_object_type.value:
             context.update({
-                'extra_columns': [
+                'extra_columns': (
                     {
                         'name': _('Type'),
                         'attribute': lambda x: x._meta.verbose_name[0].upper() + x._meta.verbose_name[1:]
-                    }
+                    },
-                ]
+                )
             })
 
         return context

mayan/apps/metadata/views.py

@@ -181,8 +181,10 @@ def metadata_edit(request, document_id=None, document_id_list=None):
         len(documents)
     )
 
-    return render_to_response('appearance/generic_form.html', context,
+    return render_to_response(
-                              context_instance=RequestContext(request))
+        'appearance/generic_form.html', context,
+        context_instance=RequestContext(request)
+    )
 
 
 def metadata_multiple_edit(request):
@@ -546,14 +548,14 @@ class MetadataTypeListView(SingleObjectListView):
 
     def get_extra_context(self):
         return {
-            'title': _('Metadata types'),
+            'extra_columns': (
-            'hide_link': True,
-            'extra_columns': [
                 {
                     'name': _('Internal name'),
                     'attribute': 'name',
                 },
-            ]
+            ),
+            'hide_link': True,
+            'title': _('Metadata types'),
         }