Python: update test

python/ql/test/experimental/library-tests/frameworks/django-v2-v3/manage.py

@@ -9,7 +9,7 @@ def main():
     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'testproj.settings')
     try:
         from django.core.management import execute_from_command_line
-    except ImportError as exc:
+    except ImportError as exc:  #$ errorInfoSource exceptionSource
         raise ImportError(
             "Couldn't import Django. Are you sure it's installed and "
             "available on your PYTHONPATH environment variable? Did you "