`hpc report` silently ignore non-existent modules
hpc report my.tix NotExistingModule
reports a coverage of 100% (0/0)
This was confusing to me since I didn't even wanted to supply a module but rather two arguments to --hpcdir without noting that the flag has to be given multiple times. Instead of a ***Module hpc/path not found*** message, I got 100% converage.
$ hpc version hpc tools, version 0.67