Prevent account hierarchy assistant from opening a second account hierarchy upon completion

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23600 57a11ea4-9604-0410-9ed3-97b8803252fd
Fix some warnings while creating a new book

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23602 57a11ea4-9604-0410-9ed3-97b8803252fd