feat(models): allowing directory handler having no extractor

Author: rxpha3l

Diff for: python/unblob/models.py

@@ -408,12 +408,15 @@ def get_files(self, directory: Path) -> Iterable[Path]:
         return [path] if path.exists() else []
 
 
-class DirectoryHandler(abc.ABC):
+TExtractor = TypeVar("TExtractor", bound=Union[None, Extractor])
+
+
+class DirectoryHandler(abc.ABC, Generic[TExtractor]):
     """A directory type handler is responsible for searching, validating and "unblobbing" files from multiple files in a directory."""
 
     NAME: str
 
-    EXTRACTOR: DirectoryExtractor
+    EXTRACTOR: TExtractor
 
     PATTERN: DirectoryPattern
 
@@ -439,9 +442,6 @@ def extract(self, paths: list[Path], outdir: Path) -> Optional[ExtractResult]:
         return self.EXTRACTOR.extract(paths, outdir)
 
 
-TExtractor = TypeVar("TExtractor", bound=Union[None, Extractor])
-
-
 class Handler(abc.ABC, Generic[TExtractor]):
     """A file type handler is responsible for searching, validating and "unblobbing" files from Blobs."""