[XERCESC-712] XMLString::subString failure when len(source)==0 - ASF JIRA

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XMLString::subString(buffer,"",0,0) would not seem outrageous. Gives
ArrayIndexOutOfBoundsException.

This test in the subString code would seem to be the culprit:

if (startIndex > srcLen-1

This appears in both char* and XMLCh* versions.

PS. This could also be generalised to
XMLString::subString(buffer,text,textLen,textLen)

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XMLString::subString failure when len(source)==0