fix: look for modified fiels to commit only if there files matching the globs

Author: pvdlg

lib/git.js

@@ -10,10 +10,12 @@ const debug = require('debug')('semantic-release:git');
  * @return {Array<String>} Array of modified files path.
  */
 async function filterModifiedFiles(files, execaOpts) {
-  return (await execa.stdout('git', ['ls-files', '-m', '-o', ...files], execaOpts))
-    .split('\n')
-    .map(file => file.trim())
-    .filter(file => Boolean(file));
+  return files.length > 0
+    ? (await execa.stdout('git', ['ls-files', '-m', '-o', ...files], execaOpts))
+        .split('\n')
+        .map(file => file.trim())
+        .filter(file => Boolean(file))
+    : [];
 }
 
 /**

test/git.test.js

@@ -47,6 +47,16 @@ test('Returns [] if there is no modified files', async t => {
   await t.deepEqual(await filterModifiedFiles(['file1.js', 'file2.js'], {cwd}), []);
 });
 
+test('Returns [] if there is no files for which to check modification', async t => {
+  // Create a git repository, set the current working directory at the root of the repo
+  const {cwd} = await gitRepo();
+  // Create files
+  await outputFile(path.resolve(cwd, 'file1.js'), '');
+  await outputFile(path.resolve(cwd, 'dir/file2.js'), '');
+
+  await t.deepEqual(await filterModifiedFiles([], {cwd}), []);
+});
+
 test('Commit added files', async t => {
   // Create a git repository, set the current working directory at the root of the repo
   const {cwd} = await gitRepo();