add protection in the error handler routine in case gROOT is not yet fully initialized. Fix issue 26200.
add protection in the error handler routine in case gROOT is not yet
fully initialized. Fix issue 26200.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@18707 27541ba8-7e3a-0410-8455-c3a389f83636

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