Fixed viewing an image without a preview

boards/models/attachment/viewers.py

@@ -182,7 +182,10 b' class ImageViewer(AbstractViewer):'
             return super().get_format_view()
 
         preview_path = self.file.path.replace('.', '.200x150.')
-        pre_width, pre_height = get_image_dimensions(preview_path)
+        try:
+            pre_width, pre_height = get_image_dimensions(preview_path)
+        except Exception:
+            return super().get_format_view()
 
         split = self.file.url.rsplit('.', 1)
         w, h = 200, 150