Plus upload in progress (#5521)

* Fix frigate+ uploading bug

Fixes https://github.com/blakeblackshear/frigate/issues/5515

* wording

* Formatting

* Don't show button when event is in progress

* Don't show in download menu either

frigate/http.py

@@ -184,6 +184,18 @@ def send_to_plus(id):
         logger.error(message)
         return make_response(jsonify({"success": False, "message": message}), 404)
 
+    if event.end_time is None:
+        logger.error(f"Unable to load clean png for in-progress event: {event.id}")
+        return make_response(
+            jsonify(
+                {
+                    "success": False,
+                    "message": "Unable to load clean png for in-progress event",
+                }
+            ),
+            400,
+        )
+
     if event.plus_id:
         message = "Already submitted to plus"
         logger.error(message)
@@ -202,6 +214,15 @@ def send_to_plus(id):
             400,
         )
 
+    if image is None or image.size == 0:
+        logger.error(f"Unable to load clean png for event: {event.id}")
+        return make_response(
+            jsonify(
+                {"success": False, "message": "Unable to load clean png for event"}
+            ),
+            400,
+        )
+
     try:
         plus_id = current_app.plus_api.upload_image(image, event.camera)
     except Exception as ex: