Correct the error message provided when trying to delete the last member of a space.
Correct the error message provided when trying to delete the last member of a space.

Just happened to notice this while experimenting. The data provided
to the format call was not correct, and the ordering in the output
wasn't either.

TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace