Handle invalid wellpatterns for WCONPROD.
Given a deck with:
----
WELSPECS
'PROD' 'G1' 10 10 8400 'OIL' /
/
COMPDAT
'PROD' 10 10 3 3 'OPEN' 1* 1* 0.5 /
/
WCONPROD
'SOMETHINGELSE' 'OPEN' 'ORAT' 20000 4* 1000 /
/
----
OPM will now by default abort and inform the user that no well match
"SOMETHINGELSE".