Can't remove empty Shape Editor groups.

[janner3D]

I'm trying to clean up my Shape Editor by getting rid of these empty groups leftover from previously referenced rigs, but the trash icon in the top right of the window doesn't do anything, nor does hitting the delete key. Is there a script or something that'll allow me to delete any and all empty groups, preferably without deleting the BLend Shapes of the current rig I'm working on?

[teddude75]

If these are from a referenced file delete the blendshape groups  from the original file.

[janner3D]

I've previously removed the referenced files from the scene, but these groups are still stuck in the scene. The groups in the referenced files hold all of those files' blend shapes.

[teddude75]

Where did you make the blendShape? In the original file or in the referenced file? Make sure that you save your edits in the reference file and updating it your scene be reloading the reference.