updated failing test

Author: vivus-ignis

tests/github/test_create_github_release_notes.py

@@ -105,7 +105,7 @@ def mock_compare_apt_repo_versions(previous_version, current_version):
 
 
 def test_release_notes_compare_package_versions_section_unrecognizable_version(caplog):
-    assert release_notes_compare_package_versions_section("garden.linux", {}) is None
+    assert release_notes_compare_package_versions_section("garden.linux", {}) == ""
     assert any(
         "Unexpected version number format garden.linux" in record.message
         for record in caplog.records