Only add flags context if there are flags

Author: antonpirker

sentry_sdk/scope.py

@@ -1381,9 +1381,10 @@ def _apply_contexts_to_event(self, event, hint, options):
     def _apply_flags_to_event(self, event, hint, options):
         # type: (Event, Hint, Optional[Dict[str, Any]]) -> None
         flags = self.flags.get()
-        event.setdefault("contexts", {}).setdefault("flags", {}).update(
-            {"values": flags}
-        )
+        if len(flags) > 0:
+            event.setdefault("contexts", {}).setdefault("flags", {}).update(
+                {"values": flags}
+            )
 
     def _drop(self, cause, ty):
         # type: (Any, str) -> Optional[Any]