rotomap-edit: don't show fitted if follow fails
rotomap-edit: don't show fitted if follow fails

Now that we're using the 'space information' associated with each image,
we're doing a better job of keeping a consistent view between images
when there are no other reference points.

Don't break this by doing 'show_fitted' if the follow target can't be
found.

aevri/mel,aevri/mel