Improve type checks under check-untyped-defs

src/ocrmypdf/_graft.py

@@ -446,7 +446,7 @@ class OcrGrafter:
         self.pdf_base.close()
         return self.output_file
 
-    def _parse_hocr_pages(self):
+    def _parse_hocr_pages(self) -> list[Fpdf2ParsedPage]:
         """Render all pages to multi-page PDF with shared fonts, then graft."""
         from ocrmypdf.hocrtransform.hocr_parser import HocrParser
 

src/ocrmypdf/_options.py

@@ -464,7 +464,7 @@ class OcrOptions(BaseModel):
         ):
             raise ValueError(
                 "Since you specified `--output-type none`, the output file "
-                f"{self.output_file} cannot be produced. Set the output file to "
+                f"{str(self.output_file)} cannot be produced. Set the output file to "
                 f"`-` to suppress this message."
             )
         return self

src/ocrmypdf/_plugin_registry.py

@@ -21,7 +21,7 @@ class PluginOptionRegistry:
     compatibility (e.g., options.tesseract_timeout).
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._option_models: dict[str, type[BaseModel]] = {}
 
     def register_option_model(

src/ocrmypdf/pdfinfo/info.py

@@ -550,6 +550,8 @@ def main():  # pragma: no cover
     pprint(pdfinfo)
     for page in pdfinfo.pages:
         pprint(page)
+        if page is None:
+            continue
         for im in page.images:
             pprint(im)