Fail if connection to dynamodb was not established (#29)

Author: jacekszubert

dynamodump.py

@@ -503,6 +503,12 @@ def do_restore(conn, sleep_interval, source_table, destination_table, write_capa
         sleep_interval = AWS_SLEEP_INTERVAL
 
 
+# don't proceed if connection is not established
+if not conn:
+    logging.info('Unable to establish connection with dynamodb')
+    sys.exit(1)
+
+
 # set prefix separator
 prefix_separator = DEFAULT_PREFIX_SEPARATOR
 if args.prefixSeparator is not None: