Fix minor bug (empty lines fail)

README.md

@@ -179,6 +179,7 @@ following sample config:
 ### Unreleased
 
 <!-- bumpversion-changelog -->
+- Bugfix for empty line handling in `alphabetize-codeowners`
 
 ### 0.6.5
 

src/texthooks/alphabetize_codeowners.py

@@ -42,7 +42,7 @@ def _add_files_arg(parser):
 
 
 def sort_line(line: str) -> str:
-    if line == "" or line.strip().startswith("#"):
+    if line.strip() == "" or line.strip().startswith("#"):
         return line
     # also normalizes whitespace
     path, *owners = line.split()

tests/acceptance/test_alphabetize_codeowners.py

@@ -21,3 +21,16 @@ def test_alphabetize_codeowners_sorts(runner):
     result = runner(alphabetize_codeowners_main, "/foo/bar.txt @Bob @alice @charlie")
     assert result.exit_code == 1
     assert result.file_data == "/foo/bar.txt @alice @Bob @charlie"
+
+
+def test_alphabetize_codeowners_ignores_non_semantic_lines(runner):
+    result = runner(
+        alphabetize_codeowners_main,
+        """
+# comment 1: some comment
+
+# comment 2: some non-alphabetized strings
+# d c b a
+/foo/bar.txt @alice @charlie""",
+    )
+    assert result.exit_code == 0