Allow downloading images from servers that don't provice content-length header

boards/forms.py

@@ -249,11 +249,14 b' class PostForm(NeboardForm):'
             response_head = requests.head(url, verify=False)
             content_type = response_head.headers['content-type']
             if content_type in CONTENT_TYPE_IMAGE:
-                length = int(response_head.headers['content-length'])
-                if length > board_settings.MAX_IMAGE_SIZE:
-                    raise forms.ValidationError(
-                        _('Image must be less than %s bytes')
-                        % str(board_settings.MAX_IMAGE_SIZE))
+                length_header = response_head.headers.get('content-length')
+                # TODO Do something if there is no such header
+                if length_header:
+                    length = int(length_header)
+                    if length > board_settings.MAX_IMAGE_SIZE:
+                        raise forms.ValidationError(
+                            _('Image must be less than %s bytes')
+                            % str(board_settings.MAX_IMAGE_SIZE))
 
                 # Get the actual content into memory
                 response = requests.get(url, verify=False)
@@ -268,6 +271,8 b' class PostForm(NeboardForm):'
                                                   content_type)
         except Exception:
             # Just return non image
+            import traceback
+            traceback.print_exc()
             pass
 
         return img_temp