Bug in BW import if corresponding regular well not in RMS project

[tnatt]

Bug triggered when a well is present in a BW object but does not exist in the RMS project, i.e. either deleted or renamed after the BW job was run. This is a corner case and will not occur often, but still we should get it fixed.

xtgeo/src/xtgeo/well/_blockedwell_roxapi.py

Lines 135 to 143 in 934e94c

	if wname in rox.project.wells:
	self._rkb = rox.project.wells[wname].rkb
	self._xpos, self._ypos = rox.project.wells[wname].wellhead
	else:
	self._rkb = None
	self._xpos, self._ypos = (
	self._df[_AttrName.XNAME.value][0],
	self._df[_AttrName.YNAME.value][0],
	)

The self._df attribute was deleted in #1061.