[experiments] Only allow resetting experiments that are done

beat/web/experiments/models.py

@@ -664,6 +664,8 @@ class Experiment(Shareable):
     def reset(self):
         """Resets an experiment so it can be run again"""
 
+        if not self.done(): return #can only reset experiments which are done
+
         self.blocks.update(
             status=Block.NOT_CACHED,
             start_date=None,