insert SMILES, any [C@H], clean up --> NPE

[rwst]

depends on https://sourceforge.net/p/cdk/bugs/1269/

java.lang.NullPointerException
at javax.vecmath.Tuple2d.(Tuple2d.java:82)
at javax.vecmath.Vector2d.(Vector2d.java:86)
at org.openscience.cdk.layout.AtomPlacer.distributePartners(AtomPlacer.java:163)
at org.openscience.cdk.layout.HydrogenPlacer.placeHydrogens2D(HydrogenPlacer.java:112)
at org.openscience.cdk.layout.HydrogenPlacer.placeHydrogens2D(HydrogenPlacer.java:68)
at org.openscience.cdk.layout.StructureDiagramGenerator.generateExperimentalCoordinates(StructureDiagramGenerator.java:280)
at org.openscience.cdk.layout.StructureDiagramGenerator.generateExperimentalCoordinates(StructureDiagramGenerator.java:248)
at org.openscience.jchempaint.controller.ControllerHub.generateNewCoordinates(ControllerHub.java:1266)
at org.openscience.jchempaint.controller.ControllerHub.cleanup(ControllerHub.java:1227)
at org.openscience.jchempaint.action.CleanupAction.actionPerformed(CleanupAction.java:61)