Deal with modules that don't export any symbols
Deal with modules that don't export any symbols

If a module exports no symbols, it gets an 'undefined' rating.  Test for
the case that there are no exported symbols, like Test::Pod::Coverage does,
and make it a 'pass'.

Signed-off-by: Sam Vilain <9e3d9c151a1935fa51df4c7420358e0667b0b28d@catalyst.net.nz>

catalyst/PRANG,catalyst/PRANG