TYPO3 Core

Exceptions that an image could not be rendered must not be silently ignored but thrown or logged in the production context

If you add for example this viewhelper <f:image src="http://test.com/image.jpg" /> (yes that wont work but i also wonder why it is not possible to add a url to an image and then just render it) you'll get an <img /> tag and thats it. No logging - no information about a broken image tag.