[Libreoffice] [last REVIEW needed] trivial PPTX import crash fix

[Katarina Machalkova]

> 	To avoid a NULL pointer de-reference, don't de-reference a null
> pointer :-) I'd like to get this into 3.4.0

You've my '+1 '

frozenB.
-- 
  \\\\\              Katarina Machalkova    
  \\\\\\\__o          LibO developer
__\\\\\\\'/_          & hedgehog painter
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