Merge pull request #446 from open-craft/jill/allow-empty-me-summary

Allow empty inserts for ModuleEngagementSummaryMetricRangesMysqlTask

edx/analytics/tasks/insights/module_engagement.py

@@ -766,6 +766,10 @@ class ModuleEngagementSummaryMetricRangesMysqlTask(ModuleEngagementDownstreamMix
                     'want.',
         significant=False
     )
+    allow_empty_insert = luigi.BooleanParameter(
+        default=False,
+        config_path={'section': 'module-engagement', 'name': 'allow_empty_insert'},
+    )
 
     @property
     def table(self):