Remove check for 0 MP from 'z' command.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9929 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 9, 2009
VXXTWKGXYSLBCPLPMX677S5IU5AGCZGNJR4XS3UN6UIQYVTLZGMAC
Change contents