More fixes for statistics

beat/core/stats.py

@@ -280,6 +280,15 @@ def cpu_statistics(start, end):
 
   """
 
+  if not end.has_key('system_cpu_usage'):
+    return {
+            'user': 0.0,
+            'system': 0.0,
+            'total': 0.0,
+            'percent': 0.0,
+            'processors': 1,
+           }
+
   if start is not None:
     user_cpu = end['cpu_usage']['total_usage'] - \
         start['cpu_usage']['total_usage']