THistSvc::io_reinit: Handle case of empty new filename

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.

mentioned in merge request atlas/athena!26031 (merged)

mentioned in commit fwinkl/athena@f6ec86bb

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• [2019-09-18 15:30] Validation started with lhcb-gaudi-head-py3#177
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I assume this is fine for LHCb. @leggett could you cherry-pick this into AtlasGaudi?

mentioned in merge request atlas/Gaudi!212 (merged)

mentioned in merge request atlas/athena!26083 (merged)

@fwinkl: see atlas/athena!26083 (merged)

changed milestone to %v32r2

approved this merge request

assigned to @clemenci

merged

mentioned in commit f3ed2d1e