Merge pull request #1023 from lorin/postgres-user-fix

Fix postgresql_user bug

library/postgresql_user

@@ -115,6 +115,8 @@ def get_database_privileges(cursor, user, db):
     query = 'SELECT datacl FROM pg_database WHERE datname = %s'
     cursor.execute(query, (db,))
     datacl = cursor.fetchone()[0]
+    if datacl is None:
+        return []
     r = re.search('%s=(C?T?c?)/[a-z]+\,?' % user, datacl)
     if r is None:
         return []