Check for null account pointers in gnc_tree_view_account_set_selected_accounts.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23547 57a11ea4-9604-0410-9ed3-97b8803252fd
Ignore XCode projects

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23548 57a11ea4-9604-0410-9ed3-97b8803252fd
Ignore missing accounts in gnc:filter-accountlist-type to avoid an assert.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23549 57a11ea4-9604-0410-9ed3-97b8803252fd