Otherwise rsync will fail to copy the contents in there and crash.

There are two issues with the failure in branched composes now: first the Server variant on armhfp is copied separately, but it should ideally be in one rsync call. This is because there is empty images/ subdir there (because all image tasks failed) not mentioned in any metadata.

The second problem is that rsync will then fail to copy the data into the nonexistent directory, which is what this pull request fixes.