[Kernel] LayoutDataUtils.setConnectorOffsetOrientation() causes NPE in LayoutDataUIUtils.getConnectorOrientation()
When combining these two methods the first one causes an NPE in the
second one.
Root cause is
either LayoutDataUIUtils:136: an unchecked use of the returned model
or OffsetOrientationUtils.setOffsetOrientation: 70: the removal of the
layout model
(from redmine: issue id 3868, created on 2019-11-07)