Avoid expensive notifications processing after compare editor is closed

The notifications come because the Comparison's adapter list is cleared.
That notifies all the adapters, and those result in viewer refreshes.
But at this point the viewer input is null and a viewer with null input
shows nothing and hence needs no refreshes.

Change-Id: I92329bd591a93718d9686c2e2921fbfbc0d755d1
Signed-off-by: Philip Langer <planger@eclipsesource.com>
1 file changed