cubicweb-datacat #5693917 Tests are randomly failing [done]

From time to time, got the following error while running tests in unittest_dataimport.py:

AssertionError: Ext entity file:///opt/local/yvote/ProjetsDev/cubicweb/cubes/datacat/test/data/dset1b.n3 in first variable not found in second one.
priorityimportant
typebug
done in<not specified>
load left0.000
closed by#7558b648d78e [tests] Fix random test failure.
patch[tests] Fix random test failure. [applied]