if can't find man page, prompt for another

[Dan Jacobson]

M-x man gnupg
Loading man...done
Invoking man gnupg in the background
Please wait: making up the gnupg man page...
gnupg man page made up
error in process sentinel: Man-goto-page: Can't find the gnupg manpage
error in process sentinel: Can't find the gnupg manpage

OK, how about here prompting me for a different man page, instead of
having me type in
M-x man (gpg) again.
True in the shell we don't get such pampering, but a ^P and we are
back in action.  In emacs it is an ESC x ESC p RET ... etc.
Anyways the current feeling is one has caused a big error and all the
wheels fall off and you are left there sitting in the middle of the
street.  There is even a flash or beep to make you feel more silly:
oh, Jenkins on the terminal in row 4 committed another error.
Instead my approach brings the warmth of mom to the user: no Jenkins,
you are not wrong.  It is the tool providers fault for the confusing
man page name which you didn't remember.  Here, have a prompt, and try
again. 
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