feat(commit): added a --allow-empty flag to commit command

Author: Dranaxel

commitizen/commands/commit.py

@@ -64,7 +64,9 @@ def prompt_commit_questions(self) -> str:
     def __call__(self):
         dry_run: bool = self.arguments.get("dry_run")
 
-        if git.is_staging_clean() and not dry_run:
+        allow_empty: bool = self.arguments.get("allow_empty")
+
+        if git.is_staging_clean() and not (dry_run or allow_empty):
             raise NothingToCommitError("No files added to staging!")
 
         retry: bool = self.arguments.get("retry")

tests/commands/test_commit_command.py

@@ -38,7 +38,7 @@ def test_commit(config, mocker):
     success_mock = mocker.patch("commitizen.out.success")
 
     commands.Commit(config, {})()
-    success_mock.assert_called_once()
+   success_mock.assert_called_once()
 
 
 @pytest.mark.usefixtures("staging_is_clean")