[Bf-committers] Fix for border-related crash

[Chris Burt]

If border button was pressed and no area was selected there was a crash. 
This fixes the crash and results in a bank img buf. Not sure if this is 
the best behavior but if you look at initrender.c, its the same result 
as the illegal combinations for rendering in parts. Perhaps there should 
be a *real* error message thrown by these events. i.e. a message box 
that appears and warns the user of their error. Currently the errors 
simply print to the console.. its not really very useful.

Thanks!
--Chris
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