Ignore histograms with negative sums.

mozaggregator/aggregator.py

@@ -87,7 +87,7 @@ def _extract_histogram(state, histogram, histogram_name, label, is_child):
         return
 
     sum = histogram.get("sum", None)
-    if not isinstance(sum, (int, long)):
+    if not isinstance(sum, (int, long)) or sum < 0:
         return
 
     histogram_type = histogram.get("histogram_type", None)

setup.py

@@ -12,7 +12,7 @@ import setuptools.command.install
 
 
 setup(name='python_mozaggregator',
-      version='0.2.1.6',
+      version='0.2.1.7',
       author='Roberto Agostino Vitillo',
       author_email='rvitillo@mozilla.com',
       description='Telemetry aggregation job',