rework how "other" options are handled in nancy run

Author: NikolayS

nancy_run.sh

@@ -241,7 +241,13 @@ while true; do
       exit 1;
       break ;;
     * )
-      [ "$1" != "" ] && >&2 echo "ERROR: Invalid option '$1'. Please double-check options." && exit 1;
+      if [ "${1:0:2}" == "--" ]; then
+        >&2 echo "ERROR: Invalid option '$1'. Please double-check options."
+        exit 1
+      else
+        >&2 echo "ERROR: \"nancy run\" does not support payload (except \"help\"). Use options, see \"nancy run help\"."
+        exit 1
+      fi
     break ;;
   esac
 done