FIX Layer.opacity was not always set
FIX Layer.opacity was not always set

This was the reason that the feature opacity and fillOpacity were sometimes ignored, as the layer.opacity is used as a scaling factor to compute the final opacity, and if it's undefined, the feature's (fill) opacity becomes NaN.
c-martinez/csWeb,TNOCS/csWeb,c-martinez/csWeb,indodutch/csWeb,indodutch/csWeb,c-martinez/csWeb,TNOCS/csWeb,indodutch/csWeb,TNOCS/csWeb