At least I think so. Thus now the code that queries the state of the
toolbar controls only queries dataset if connection is active.

Operating the navigation buttons (next/prev) will, naturally, activate
connection if not yet active. This should also enable the other controls
that may be initially disabled: create/save/print/email documents. Thus,
the navigation controls also check if they have activated the connection,
and invalidate said document creation controls state. Possibly there's a
better place for the invalidation of the controls, but I was unable to
find one.

Regression after commit 5c2c5ff0

Change-Id: I76f895c871718c9c761339ba03963baf6837b592
Reviewed-on: https://gerrit.libreoffice.org/64738
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>