Fixed a logic error when generating incremental changelogs

Author: coordt

generate_changelog/cli.py

@@ -101,7 +101,8 @@ def main(
     release_hint = suggest_release_type(current_branch.name, version_contexts, config)
 
     # use the output pipeline to deal with the rendered change log.
-    rendered_chglog = templating.render_changelog(version_contexts, config, not starting_tag)
+    has_starting_tag = bool(starting_tag)
+    rendered_chglog = templating.render_changelog(version_contexts, config, has_starting_tag)
 
     if not skip_output_pipeline:
         echo_func("Executing output pipeline.")

test/test_cli.py

@@ -59,7 +59,7 @@ def test_app_generate_notes(default_repo):
         print(result.stdout)
         traceback.print_exception(*result.exc_info)
     assert result.exit_code == 0
-    assert result.stdout.startswith("## Unreleased")
+    assert result.stdout.startswith("# Changelog")
 
 
 def test_app_generate_all(default_repo):
@@ -70,5 +70,5 @@ def test_app_generate_all(default_repo):
         traceback.print_exception(*result.exc_info)
     assert result.exit_code == 0
     output = json.loads(result.stdout)
-    assert output["notes"].startswith("## Unreleased")
+    assert output["notes"].startswith("# Changelog")
     assert "minor" == output["release_hint"]