In a previous commit (f6d0fedaf14b583df7bd26078a8a22b557be57c6) we fixed
a bug, which was about getting the difference of false positive reports
in a baseline to a local directory. For further details see the message
of that commit. However, another bug still remained in the system, when
the diff command compared a report directory to a specific run tag. This
case is fixed by this commit.