ppd-ipp.c: Fix crash if ppd_size is NULL #37
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In some cases `ppd_size` can be NULL after `ppdPageSize()` - in such cases a program using libppd will crash because the pointer is accessed later. Fixes OpenPrinting#31
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In some cases
ppd_sizecan be NULL afterppdPageSize()- in such cases a program using libppd will crash because the pointer is accessed later.Fixes #31