Sweeping !1070 from master to devel: [master] Fix extracting GUID from ROOT files (!1073) · Merge requests · LHCb Dirac / LHCbDIRAC

At some point we upgraded to uproot 4 which now treats branch names as strings instead of binary data.

BEGINRELEASENOTES

*Core FIX: Fix extracting GUID from ROOT files with Python 3

ENDRELEASENOTES

Sweeping !1070 from master to devel: [master] Fix extracting GUID from ROOT files