Fix a bunch of warnings and errors during startup.

[Derek Atkins]

Log Message:
-----------
Fix a bunch of warnings and errors during startup.

	* lib/egg/egg-menu-merge.c:
	  we don't have a "ui" so dont notify ourself when merging.
	* src/gnome-utils/gnc-menu-extensions.scm:
	  Use empty strings instead of #f for menu items so we don't
	  cause problems later where we expect to get an actual string.
	* src/report/report-gnome/report-gnome.scm:
	  Make sure we actually have a menu-path list!

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/lib/egg:
        egg-menu-merge.c
    gnucash/src/gnome-utils:
        gnc-menu-extensions.scm
    gnucash/src/report/report-gnome:
        report-gnome.scm