[Patch] fix for crash in KStringHandler

[Leo Savernik]

Hello,

Since KDE 3.4.0, Kopete aborts with a SIGFPE on initial connect or even on 
startup.

Tracing it down, I found the culprit to be a division by zero. Don't ask me 
why QFontMetrics::maxWidth can return 0, but it sometimes does, leading to an 
imminent crash.

The patch below fixes the division by zero.
Ok for HEAD and branch?

mfg
	Leo
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