[tex-live] [pretest] tlmgr warning about uninitialized value

[Karl Berry]

    Use of uninitialized value $opts{"verify-repo"} in string eq at
    C:\Programme1\texlive\2018\texmf-dist\scripts\texlive\tlmgr.pl line 6563.

Thanks. I added some tests against that error message, though I can't
say I tried to reproduce or debug all the many cases involved :(. -k