This was reported in T90026 for attributes, but was also true for:

• UVMaps
• Vertex Colors
• Sculpt Vertex Colors
• Face Maps

For Vertex groups and Shapekeys this was already done (in that their
remove poll would check if there is a vertex group or shapekey to begin
with), now make this consistent across all mentioned types.

Thx @Vincent Blankfield (vvv) for the initial patch (where this was done for attributes only)

ref T90026