Skip piuparts policy if summary file is missing

britney2/policies/policy.py

@@ -626,6 +626,10 @@ class PiupartsPolicy(BasePolicy):
 
     def _read_piuparts_summary(self, filename, keep_url=True):
         summary = {}
+        if not os.path.exists(filename):
+            self.log("%s missing; skipping piuparts processing" % filename)
+            return summary
+
         self.log("Loading piuparts report from {0}".format(filename))
         with open(filename) as fd:
             if os.fstat(fd.fileno()).st_size < 1: