Show proper error on argument parse when using api-cli

rhodecode/bin/rhodecode_api.py

@@ -223,7 +223,12 b' def main(argv=None):'
     method = args.method
     if method == '_create_config':
         sys.exit()
-    margs = dict(map(lambda s: s.split(':', 1), other))
+
+    try:
+        margs = dict(map(lambda s: s.split(':', 1), other))
+    except:
+        sys.stderr.write('Error parsing arguments \n')
+        sys.exit()
 
     api_call(apikey, host, args.format, method, **margs)
     return 0