zshrc: handle pmrep completion corner case
zshrc: handle pmrep completion corner case

In case even system-wide pmrep.conf is unavailable.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp