Revert "adding cleanup of stale track entries"

This reverts commit 1a2506742f.

test/test_scanner.py

@@ -38,10 +38,6 @@ def test_scanner(monkeypatch, in_memory_db, media):
     # replace the filesystem glob with the test fixture generator
     monkeypatch.setattr(scanner.MediaScanner, 'find_sources', MagicMock(return_value=media()))
 
-    # pretend things exist
-    monkeypatch.setattr(scanner.Path, 'exists', MagicMock(return_value=True))
-    monkeypatch.setattr(scanner.Path, 'is_dir', MagicMock(return_value=False))
-
     def mock_loader(path):
         return {
             'artist': 'foo',

test/test_shell.py

@@ -16,10 +16,6 @@ def response_factory(responses):
     return MagicMock(side_effect=responses + ([''] * 10))
 
 
-def test_commands(cmd_prompt):
-    assert cmd_prompt.commands.keys() == cmd_prompt.commands.keys()
-
-
 @pytest.mark.parametrize('inputs, expected', [
     (['stats'], 'Database contains 4 playlists'),  # match the db fixture
 ])