BUG: standoff causes axis title position to break if no tick labels

[ayjayt]

Fix: #6889

Back to building other features soon, but this bug interfered with a pozo release...

Mocks to show the error are over here: geopozo@fbb56f3

If you set a standoff and eliminate tick labels (via nticks=0, tickvals=[], showticklabels=false, whatever), the positioning system for the axis titles just breaks.

standoff is one of our only tools for positioning the title!