Bugfixes for spotfinder_frame when using dials.image_viewer with an experiments.json file including a crystal model.
Bugfixes for spotfinder_frame when using dials.image_viewer with an experiments.json file including a crystal model.

1) If a still image, don't rotate r around a gonio axis.
2) If the direct beam doesn't hit a panel, still try to compute a beam center using panel 0.

dials/dials,dials/dials,dials/dials,dials/dials,dials/dials