Creates a New Tab Group on Prompt No Matter What

[noctuid]

When attempting to switch to a tab group that doesn't exist, tab groupie will prompt you whether you want to create it. Giving it "n", "b", or "Y" will all make the new tab group (which won't show up in tab completion at first; deleted groups won't be removed and created groups won't be added until another tgroup command is entered, though I don't think this bug is related). Trying to switch to another tabgroup will then give the error 159: TypeError: activeTab is null

tgroup-switch starts working normally again only after doing something like :buffer to switch back to a previous tab group and deleting the created tab group.