fix: skip linguist and gist update when no file changes found

Author: liby

src/index.ts

@@ -127,6 +127,11 @@ const main = async () => {
     console.log('\n');
 
     const files = processCommits(commits);
+    if (files.length === 0) {
+      console.log('No file changes found. Skipping gist update.');
+      return;
+    }
+
     const langs = await runLinguist(files);
     console.log('\nLanguage statistics:');
     for (const lang of langs) {