* lisp/mh-e/mh-funcs.el (mh-kill-folder)
* lisp/mh-e/mh-search.el (mh-index-new-folder)
* lisp/mh-e/mh-utils.el (mh-prompt-for-folder):
Check for existence of 'speedbar-buffer' rather than
'mh-speed-folder-map'. The latter can exist if
'mh-speed' has only been loaded but not displayed.
(cherry picked from commit e6a2901b1b)
d4b9cb6b5b