Ignore commits that have no author email

Git requires email and name to set properly. These fields can be empty only in old (pre-Essex) commits.

Closes bug 1240081

Change-Id: I139d001b28c23bea83651667f9a7ae075a1ac332

stackalytics/processor/utils.py

@@ -50,7 +50,9 @@ def week_to_date(week):
 
 
 def check_email_validity(email):
-    return re.match(r'[\w\d_\.-]+@([\w\d_\.-]+\.)+[\w]+', email)
+    if email:
+        return re.match(r'[\w\d_\.-]+@([\w\d_\.-]+\.)+[\w]+', email)
+    return False
 
 
 def read_uri(uri):

stackalytics/processor/vcs.py

@@ -20,6 +20,7 @@ import re
 import sh
 
 from stackalytics.openstack.common import log as logging
+from stackalytics.processor import utils
 
 
 LOG = logging.getLogger(__name__)
@@ -149,6 +150,9 @@ class Git(Vcs):
                 commit[param[0]] = unicode(rec.group(i), 'utf8')
                 i += 1
 
+            if not utils.check_email_validity(commit['author_email']):
+                continue
+
             commit['files_changed'] = int(rec.group(i))
             i += 1
             lines_changed_group = rec.group(i)