fix: no excess files in manifest (#48)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: AndersDJohnson

packages/eslint-plugin-rebase/src/rebase.ts

@@ -66,7 +66,7 @@ const rebase = ({ files, cliEngine }: RebaseOptions) => {
       break;
     }
 
-    if (!fileIgnores) {
+    if (!fileIgnores || !Object.keys(fileIgnores).length) {
       break;
     }