If image (DOES NOT EXIST) AND (maxWidth/maxHeight) ARE set, the stream never closes

If image (DOES NOT EXIST) AND (maxWidth/maxHeight) ARE set, the stream never closes and there is endless waiting for the image. Especially a problem when trying to get images in a FutureBuilder or when doing a retry to get the image again, nothing happens as an image streamlistener is already running.

This is in the context of a `CachedNetworkImageProvider`.

Removing (maxWidth/maxHeight) solves the issue. Then the stream closes and things work as they should.

Start at CachedNetworkImageProvider and reproduce the issue with a missing image while maxWidth or maxHeight is set. Verify that the image stream closes and that a FutureBuilder or retry can request the image again without an existing listener blocking it.

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