MPS-18766 Node read access to child not recorded if there is only one child in parent node
MPS-18768 [build:IU-129.713] Error during dispatching of java.awt.event.MouseEvent[MOUSE_RELEASED,(1297,983),absolute(1293,979),button=3,modifiers=Meta+Button3,clickCount=1] on frame0
MPS-18766 Node read access to child not recorded if there is only one child in parent node
- optimizing tests (better access to child elements in a snode)
Merge remote-tracking branch 'origin/MPS3.0' into 3.0/ashatalin_bugfixes