TYPO3 Core

If you process a static file outside of the storage (without fal) it uses the hardcoded "Fallback Storage" (uid 0). This fallback-storage uses "typo3temp/assets/_processed_" as processingfolder.
Now if you try to delete the processed files in this folder using Maintenance > Remove Temporary Assets in the Install-Tool, an error occures. This is because the storage with the uid 0 cannot be found and it does not fall back to the hardcoded storage.

Steps to reproduce:
1. Process an image outside the storage

page = PAGE
page.10 = IMAGE
page.10 {
  file = typo3conf/ext/styleguide/Resources/Public/Images/colorpicker.jpg
  file.width = 100
}

2. Try removing the processed file using the install tool
Maintenance > Remove Temporary Assets > Delete 1 files in /typo3temp/assets/_processed_

=> An error will occur

I discovered this issue because news renders its dummy image using the ImageViewHelper.