Don't print mongodump stderr if the line is empty (date only), pt 3

Author: timvaillancourt

mongodb_consistent_backup/Common/__init__.py

@@ -4,4 +4,4 @@
 from Lock import Lock
 from MongoUri import MongoUri
 from Timer import Timer
-from Util import config_to_string, parse_method, validate_hostname 
+from Util import config_to_string, is_datetime, parse_method, validate_hostname