Implemented fix for FileNotFound errors with Active Storage

This commit adds the ability for the application to catch missing
images with Active Storage during an API call should a file become
corrupt or deleted without removing the record through appropriate channels.
This compliments PR solidusio#4026 which prevented the same error on the backend.
The change will return and image with attributes equal to nil and
noimage replacements if an image cannot be sourced.

Reasons for the changes:
- image.attachment.url bypasses rescue check found in ActiveStorageAdapter

- API calls hit height and width prior to url rescue, had to implement
  rescue in Attachment#metadata.

api/app/views/spree/api/images/_image.json.jbuilder

@@ -3,5 +3,5 @@
 json.(image, *image_attributes)
 json.(image, :viewable_type, :viewable_id)
 Spree::Image.attachment_definitions[:attachment][:styles].each do |key, _value|
-  json.set! "#{key}_url", image.attachment.url(key)
+  json.set! "#{key}_url", image.url(key)
 end

api/spec/requests/spree/api/images_controller_spec.rb

@@ -74,6 +74,16 @@ module Spree
           expect(response.status).to eq(204)
           expect { product_image.reload }.to raise_error(ActiveRecord::RecordNotFound)
         end
+
+        it "returns nil attribute values and noimage urls when the image cannot be found",
+           if: Spree::Config.image_attachment_module == Spree::Image::ActiveStorageAttachment do
+          product_image.attachment.blob.update(key: 11)
+          get spree.api_variant_images_path(product.master.id)
+          expect(response.status).to eq(200)
+          expect(json_response[:images].first[:attachment_width]).to be_nil
+          expect(json_response[:images].first[:attachment_height]).to be_nil
+          expect(json_response[:images].first[:product_url]).to include("noimage")
+        end
       end
 
       context 'when image belongs to another product' do

core/app/models/concerns/spree/active_storage_adapter/attachment.rb

@@ -53,8 +53,9 @@ def destroy
 
       def metadata
         analyze unless analyzed?
-
         @attachment.metadata
+      rescue ActiveStorage::FileNotFoundError
+        { identified: nil, width: nil, height: nil, analyzed: false }
       end
 
       def normalize_styles(styles)