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THistSvc::io_reinit: Handle case of empty new filename

Frank Winklmeier requested to merge fwinkl/Gaudi:thistsvc_ioreinit into master

In case no new file name was set, e.g. by not calling io_update_all, do not try to open a file with an empty file name. This is a common use-case in case the mother process is continuing to use its initial set of ROOT files.

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