Fixes TemplateDebugPanel iterating over an unknown template without origin or name

Author: maraujop

debug_toolbar/panels/template.py

@@ -78,6 +78,8 @@ def content(self):
             # Skip templates that we are generating through the debug toolbar.
             if template.name and template.name.startswith('debug_toolbar/'):
                 continue
+            if template.name == "<Unknown Template>":
+                continue
             if template.origin and template.origin.name:
                 template.origin_name = template.origin.name
             else: