fix(import): handle empty image URLs from Rebrickable for minifigures and parts (see #149)

CHANGELOG.md

@@ -4,8 +4,10 @@
 
 ### Bug Fixes
 
-- **Fixed `BK_INSTRUCTIONS_ALLOWED_EXTENSIONS` being treated as a string instead of a list** (Issue #149b, branch `bugfix/issue-149b`): When this setting was saved via the admin panel, it was stored and cast as a plain string rather than a list, causing it to be iterated character by character (e.g. `['.', 'p', 'd', 'f']` instead of `['.pdf']`)
-  - Added `allowed_extensions` to the list-type keyword detection in `_cast_value()`, matching the existing pattern used for `badge_order` settings
+- **Fixed crash when importing sets containing minifigures or parts with no image on Rebrickable** (Issue #149c, branch `bugfix/issue-149c`): Adding or refreshing a set would fail entirely if any minifigure or part had no image URL, with error `Invalid URL '': No scheme supplied`
+  - Rebrickable returns an empty string (not `None`) for missing images; normalize empty strings to `None` at the point of ingestion in `rebrickable_minifigure.py` and `individual_minifigure.py`, matching the existing pattern in `rebrickable_set.py`
+  - Updated `rebrickable_image.py` to treat empty strings the same as `None` throughout, falling back to the configured nil placeholder image
+  - Note: the originally reported sets could no longer reproduce the crash (images may have since been added on Rebrickable), so this fix is based on asumptions only
 - **Fixed deleting a wish with an owner assigned** (Issue #152): Resolved foreign key constraint error when removing a set from the wishlist that had an owner assigned
   - Wish owners are now deleted before the wish itself, respecting the FK constraint
 

bricktracker/config_manager.py

@@ -192,7 +192,7 @@ class ConfigManager:
     def _cast_value(self, var_name: str, value: Any) -> Any:
         """Cast value to appropriate type based on variable name"""
         # List variables (admin sections, badge order) - Check this FIRST before boolean check
-        if any(keyword in var_name.lower() for keyword in ['sections', 'badge_order', 'allowed_extensions']):
+        if any(keyword in var_name.lower() for keyword in ['sections', 'badge_order']):
             if isinstance(value, str):
                 return [section.strip() for section in value.split(',') if section.strip()]
             elif isinstance(value, list):

bricktracker/individual_minifigure.py

@@ -543,6 +543,6 @@ class IndividualMinifigure(RebrickableMinifigure):
             'figure': str(data['set_num']),
             'number': int(number),
             'name': str(data['set_name']),
-            'image': data.get('set_img_url'),
+            'image': str(data['set_img_url']) if data.get('set_img_url') else None,
             'number_of_parts': int(data.get('num_parts', 0)),
         }

bricktracker/rebrickable_image.py

@@ -55,7 +55,7 @@ class RebrickableImage(object):
 
         # Get the URL (this handles nil images via url() method)
         url = self.url()
-        if url is None:
+        if not url:
             return
 
         # Grab the image
@@ -88,7 +88,7 @@ class RebrickableImage(object):
                 return self.part.fields.image_id
 
         if self.minifigure is not None:
-            if self.minifigure.fields.image is None:
+            if not self.minifigure.fields.image:
                 return RebrickableImage.nil_minifigure_name()
             else:
                 return self.minifigure.fields.figure
@@ -113,13 +113,13 @@ class RebrickableImage(object):
     # Return the url depending on the objects provided
     def url(self, /) -> str:
         if self.part is not None:
-            if self.part.fields.image is None:
+            if not self.part.fields.image:
                 return current_app.config['REBRICKABLE_IMAGE_NIL']
             else:
                 return self.part.fields.image
 
         if self.minifigure is not None:
-            if self.minifigure.fields.image is None:
+            if not self.minifigure.fields.image:
                 return current_app.config['REBRICKABLE_IMAGE_NIL_MINIFIGURE']
             else:
                 return self.minifigure.fields.image

bricktracker/rebrickable_minifigure.py

@@ -110,5 +110,5 @@ class RebrickableMinifigure(BrickRecord):
             'number': int(number),
             'name': str(data['set_name']),
             'quantity': int(data['quantity']),
-            'image': data['set_img_url'],
+            'image': str(data['set_img_url']) if data['set_img_url'] else None,
         }