Fix GH-15137: Unexpected null pointer in Zend/zend_smart_str.h #15138
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This regressed when I optimized $wholeText. The previous code used xmlStrcat which implicitly checked for a NULL argument, but now it's a direct memcpy which you shouldn't pass null pointers to, although it won't result in a crash because memcpy doesn't do anything if the length is 0.