Fix usage without modified files of git hook

PyCQA · Jul 11, 2020 · ea0642d · ea0642d
1 parent 7769781
commit ea0642d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/isort/hooks.py b/isort/hooks.py
@@ -50,6 +50,8 @@ def git_hook(strict: bool = False, modify: bool = False) -> int:
     # Get list of files modified and staged
     diff_cmd = ["git", "diff-index", "--cached", "--name-only", "--diff-filter=ACMRTUXB", "HEAD"]
     files_modified = get_lines(diff_cmd)
+    if not files_modified:
+        return 0
 
     errors = 0
     config = Config(settings_path=os.path.dirname(os.path.abspath(files_modified[0])))