[gradsusr] station data const() undef no impact

[Luan Jia]

rr:station data，have undef data
undef:9999.9
it=1,3,6,12...72

'd stnave(rr,t='72-it+1',t=72)*'it''
'd stnave(*const(rr, 0, -u)*,t='72-it+1',t=72)*'it''

the same result

BTW:* XP grads-2.0.2.oga.2 *
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