Properly set extraColumns on group-report table for anomaly vs stoppage.

dashboard/dashboard/alerts.py

Index: dashboard/dashboard/alerts.py
diff --git a/dashboard/dashboard/alerts.py b/dashboard/dashboard/alerts.py
index 5aaf109d550f2c05c91896186f34164d9d3a3ab1..ac05ea7fc690ebc342d277c7193fbd6de6c00f46 100644
--- a/dashboard/dashboard/alerts.py
+++ b/dashboard/dashboard/alerts.py
@@ -165,6 +165,7 @@ def GetAnomalyDict(anomaly_entity, bisect_status=None):
       'improvement': anomaly_entity.is_improvement,
       'bisect_status': bisect_status,
       'recovered': anomaly_entity.recovered,
+      'type': 'anomaly',
       'units': anomaly_entity.units
   })
   return alert_dict
@@ -180,6 +181,7 @@ def _GetStoppageAlertDict(stoppage_alert_entity):
       'mail_sent': stoppage_alert_entity.mail_sent,
       'last_row_date': str(last_row_date.date()) if last_row_date else 'N/A',
       'recovered': stoppage_alert_entity.recovered,
+      'type': 'stoppage_alert',
   })
   return alert_dict