Related: #i123862# use O*String's isEmpty() method...

to check for emptiness in modules starting with 'a'

Patch-by: j.nitschke@ok.de
Review-by: hdu@apache.org
(cherry picked from commit 40b2ffbb1036c2f2db50965525009213d8fd6343)

Conflicts:
	accessibility/source/extended/accessibleiconchoicectrl.cxx
	accessibility/source/extended/textwindowaccessibility.cxx
	accessibility/source/standard/vclxaccessiblebox.cxx
	accessibility/source/standard/vclxaccessibletoolboxitem.cxx
	automation/source/server/recorder.cxx
	automation/source/server/statemnt.cxx
	avmedia/source/framework/mediacontrol.cxx
	avmedia/source/framework/soundhandler.cxx
	avmedia/source/gstreamer/gstplayer.cxx
	avmedia/source/viewer/mediawindow.cxx

Change-Id: I8e6d6754282634f6931a2e7f73f08f70c23d452e