Fixed Exception in DocumentOutlinePage when no document is loaded.

When the VEX Editor has no document loaded (e.g. because the doctype is
invalid) there is no StyleSheet. This caused an NPE in the outline view.

Change-Id: I258d3bf96fd05a530c9feff114d214101ebd9c3f
Signed-off-by: Carsten Hiesserich <carsten.hie@gmail.com>
1 file changed