Sweeping !1246 from master to devel: fix (XMLFilesReaderManager): _getDataQuality does not throw an error if DQ is not set
After the refactoring of getting the DQFlag, some warning turned into errors, stopping the execution flow. This is a problem, as for some runs, we do not have the DQ yet.
This reverts back the behavior.
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*BKK
FIX: _getDataQuality does not raise an error if the DQ is not set
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