Use 404 image when no image is available

twitch/apps.py

@@ -1,8 +1,38 @@
+import io
+import logging
+from typing import TYPE_CHECKING
+
 from django.apps import AppConfig
+from django.db.models.fields.files import FieldFile
+
+if TYPE_CHECKING:
+    from collections.abc import Callable
 
 
 class TwitchConfig(AppConfig):
-    """AppConfig subclass for the 'twitch' application."""
+    """Django app configuration for the Twitch app."""
 
     default_auto_field = "django.db.models.BigAutoField"
     name = "twitch"
+
+    def ready(self) -> None:  # noqa: D102
+        logger: logging.Logger = logging.getLogger("ttvdrops.apps")
+
+        # Patch FieldFile.open to swallow FileNotFoundError and provide
+        # an empty in-memory file-like object so image dimension
+        # calculations don't crash when the on-disk file was removed.
+        try:
+            orig_open: Callable[..., FieldFile] = FieldFile.open
+
+            def _safe_open(self: FieldFile, mode: str = "rb") -> FieldFile:
+                try:
+                    return orig_open(self, mode)
+                except FileNotFoundError:
+                    # Provide an empty BytesIO so subsequent dimension checks
+                    # read harmlessly and return (None, None).
+                    self._file = io.BytesIO(b"")  # pyright: ignore[reportAttributeAccessIssue]
+                    return self
+
+            FieldFile.open = _safe_open
+        except (AttributeError, TypeError) as exc:
+            logger.debug("Failed to patch FieldFile.open: %s", exc)