Grmfetch and datget on frl field

unlike a fetch of an hl7 field…..when a field is not preent inan frl…the grmfetch errors

[0:TEST] Tcl error:

 msgId = message0

 proc = ‘hxh_ib_gae600_AIR98_gae600_Tapestry_xr’

 args = ”

 result = ‘unable to fetch ‘Gae600_PROV_END_DT”

 errorInfo: ‘

unable to fetch ‘Gae600_PROV_END_DT’

   while executing

“grmfetch $grmHd_in Gae600_PROV_END_DT”

other than wrapping all these with catches……is there an frl option or some other implicit way to handle ?>