cubicweb #4739253 KeyError when displaying rset where some symmetric relation is used [validation pending]

eg try 'Any X, Y WHERE X identical_to Y'

prioritynormal
typebug
done in3.19.9
load0.100
load left0.000
closed by#ea10572fccfe [rset] fix crash on displaying rset where some symmetric relation is used. Closes #4739253
patch[rset] fix crash on displaying rset where some symmetric relation is used. Closes #4739253 [applied]