Fix the build.

Fix the build.

Follow up to df1e6eed5a07f49eeda4c0bbd8c63d539aefdb3b.

diff --git a/spec/fabricators/optimized_image_fabricator.rb b/spec/fabricators/optimized_image_fabricator.rb
index 01523d6..b34e957 100644
--- a/spec/fabricators/optimized_image_fabricator.rb
+++ b/spec/fabricators/optimized_image_fabricator.rb
@@ -9,6 +9,8 @@ Fabricator(:optimized_image) do
   version OptimizedImage::VERSION
 
   after_build do |optimized_image, _|
-    optimized_image.url = Discourse.store.get_path_for_optimized_image(optimized_image)
+    unless optimized_image.url
+      optimized_image.url = Discourse.store.get_path_for_optimized_image(optimized_image)
+    end
   end
 end

GitHub sha: b72cec18