Early exit when no files are changed. (#456)

* Early exit when no files are changed.

As a consequence of the `checkAll` function call returning `true` if the length of `changedFiles` is 0, this must early-exit in order to avoid labeling empty PRs.

* Update dist.

* Update for new code styles.

* review changes requested

* Update dist.

* chore: prettify code

---------

Co-authored-by: MaksimZhukov <maksimzhukov@github.com>
Co-authored-by: IvanZosimov <ivanzosimov@github.com>

src/labeler.ts

@@ -48,6 +48,13 @@ export async function run() {
 
       core.debug(`fetching changed files for pr #${prNumber}`);
       const changedFiles: string[] = await getChangedFiles(client, prNumber);
+      if (!changedFiles.length) {
+        core.warning(
+          `Pull request #${prNumber} has no changed files, skipping`
+        );
+        continue;
+      }
+
       const labelGlobs: Map<string, StringOrMatchConfig[]> =
         await getLabelGlobs(client, configPath);