[Ohrrpgce] SVN: teeemcee/10395 Fix crash in zonemap editor View mode when there are no zones on the til

[subversion at HamsterRepublic.com]

teeemcee
2018-05-28 06:00:32 -0700 (Mon, 28 May 2018)
208
Fix crash in zonemap editor View mode when there are no zones on the tile

Fixed it two different ways, to be sure.

Crash happened in usemenu, and was introduced by recent usemenu cleanup.
Reported by Foxley
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U   wip/mapsubs.bas
U   wip/menus.bas