minor cleanup

1 files changed, 7 insertions, 4 deletions

diff --git a/bsie/reader/chain.py b/bsie/reader/chain.py
index 5e9e0d5..1dbc52b 100644
--- a/bsie/reader/chain.py
+++ b/bsie/reader/chain.py
@@ -73,16 +73,19 @@ class ReaderChain(base.Reader, typing.Generic[T_CONTENT]):
         return hash((super().__hash__(), self._children))
 
     def __call__(self, path: str) -> T_CONTENT:
-        raise_error = errors.UnsupportedFileFormatError
+        raise_error = False
         for child in self._children:
             try:
                 return child(path)
             except errors.UnsupportedFileFormatError:
+                # child cannot read the file, skip.
                 pass
             except errors.ReaderError:
-                # child cannot read the file, skip.
-                raise_error = errors.ReaderError # type: ignore [assignment] # mypy is confused
+                # child failed to read the file, skip.
+                raise_error = True
 
-        raise raise_error(path)
+        if raise_error:
+            raise errors.ReaderError(path)
+        raise errors.UnsupportedFileFormatError(path)
 
 ## EOF ##