If re.groups does not match, they're of type None

piphone.py

@@ -157,7 +157,7 @@ def sanitize_phonenumber(number):
     if bl_re != None:
         # We have blacklisted patterns, need to chck for them
         groups = re.match(bl_re, number)
-        if len(groups) >= 1:
+        if groups is not None:
             # We matched, so we're blacklisted
             raise ValueException('{} is blacklisted. Reason: {}', (number, groups.groupdict().keys[0],))
     return number