[PATCH] Prevent a crash if the ASCII charset registries match nothing

[stephen at xemacs.org]

Aidan Kehoe writes:
 > 
 >  Ar an tri? l? d?ag de m? na Samhain, scr?obh stephen at xemacs.org: 
 > 
 >  > QUERY
 >  > 
 >  > What's the big hurry?
 > 
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 > Where is everyone getting the impression I?m in a hurry? 

I don't speak for anybody else in this.  IMO "I'll commit this
tonight" is a *big* hurry, for those of us who should be reviewing.