Fix for null pointer dereference in the case where the expression is empty and the case-insensitive option is specified.
Fix for null pointer dereference in the case where the expression is empty and the case-insensitive option is specified.

git-svn-id: 3ec853389310512053d525963cab269c063bb453@547447 13f79535-47bb-0310-9956-ffa450edef68

Distrotech/xerces-c,ctapmex/xerces-c,ctapmex/xerces-c,Distrotech/xerces-c,colorer/xerces-c,colorer/xerces-c,Distrotech/xerces-c,colorer/xerces-c,colorer/xerces-c,ctapmex/xerces-c,Distrotech/xerces-c,colorer/xerces-c,Distrotech/xerces-c,ctapmex/xerces-c