tagbar: do not error out, if autoloaded function does not exist
tagbar: do not error out, if autoloaded function does not exist

tagbar is not loaded if filetype plugin is off, so do not try to call a
non-existent function than.

tschundler/dotfiles,rchicoli/vim-airline,bling/vim-airline,unphased/vim-airline,tschundler/dotfiles,chrisbra/vim-airline,yzhou61/vim-airline,tschundler/dotfiles