cubicweb-celerytask #16640807 Log view may traceback [validation pending]

if an unknown log level is the first log statement

prioritynormal
typebug
done in0.3.0
load left0.000
closed by#5878a8b744d4 [views] fix the logs view (closes #16640807)
patch[views] fix the logs view (closes #16640807) [applied]