Http tests (#3350)

* Set up for http tests

* Setup basics for testing and first test

* Add testing consts

* Cleanup db creation

* Add one more check to test

* Get event that does not exist

* Get events working with cleaner db

* Test retain / un-retain

* Test setting and deleting sub label

* Test getting list of sub labels

* Fix bug caught in tests

* Test deleting event

* Test geting list of events

* Expand test

* Test more event filters

* Write version module so tests don't fail on version import

* Test config

* Test recordings endpoint

* Formatting

* Remove unused imports

* Test stats

* Add cleanup files in const

* Add name to match other checks

frigate/http.py

@@ -256,7 +256,10 @@ def get_sub_labels():
         )
 
     sub_labels = [e.sub_label for e in events]
-    sub_labels.remove(None)
+
+    if None in sub_labels:
+        sub_labels.remove(None)
+
     return jsonify(sub_labels)