Try make this more robust in slow environments

...where the previous .uno:PrintPreview request has not yet been processed, the
same way it had been made more robust for ScAccessiblePageHeader.java in
5b5c52a3a4d048bba8c18dfb06ffca25c670d099 "Try make this more robust in slow
environments" plus b5dd2b4218f966e177d880bcc29fa5fba3bfe1c1 "Also cope with
intermittend DisposedExceptions."

Change-Id: I5244e8f8af9560ae986ed3a836bdf9571574420f