default-config: Don't close terminal if manpage not found.

When viewing a manual page using the "Help" menu in the
default-config, if the manual page is not found, don't close
the terminal, instead use the 'read' command to wait for user
input. This will require the user to hit 'Enter' or close the
terminal manually.

This ensures that if the manual pages are not installed the
user gets a message from man saying that the manual page cannot
be found vs just flashing a terminal.

default-config/config

@@ -109,11 +109,14 @@ AddToFunc MoveToCurrent
 # Function: ViewManPage $0
 #
 # This function loads the man page $0 in an terminal
-# and is used with the help menu.
+# and is used with the help menu. If the manual page is
+# not found, point users at fvwm.org and keep terminal open.
 DestroyFunc ViewManPage
 AddToFunc   ViewManPage
 + I Exec exec $[infostore.terminal] -g 80x40 \
-  -n "Manual Page - $0" -T "Manual Page - $0" -e man "$0"
+  -n "Manual Page - $0" -T "Manual Page - $0" -e 'man "$0" || \
+  (echo "$[gt.Documenation can be found at https://www.fvwm.org]"; \
+  read tmp)'
 
 # Function: SetBG $0
 #
@@ -702,4 +705,4 @@ DestroyModuleConfig EventNewDesk:*
 # exists, then read it. This allows changes to default-config settings
 # without needing a full copy of the default-config. This will also allow
 # default-config changes to get used after upgrades (if applicable).
-Test (f $[FVWM_USERDIR]/local.config) Read $[FVWM_USERDIR]/local.config
+Test (f $[FVWM_USERDIR]/local.config) Read $[FVWM_USERDIR]/local.config