Transformation editor: variable mapping not occurring for nested child elements

Issue

• The Transformation Editor creates a wrong mapping definition for a mapping of a variable with a more than two-level of nested properties.

• The Transformation Editor refuses to open a user modified mapping definition with a mapping of a variable with a more than two-level of nested properties and show the following error:

  java.lang.NullPointerException
      at org.jboss.tools.fuse.transformation.core.dozer.DozerMapperConfiguration.getMappingsForTarget(DozerMapperConfiguration.java:310)
      at org.jboss.tools.fuse.transformation.editor.internal.util.TransformationManager.mapped(TransformationManager.java:104)
      at org.jboss.tools.fuse.transformation.editor.internal.ModelViewer$LabelProvider.getImage(ModelViewer.java:445)
      at org.jboss.tools.fuse.transformation.editor.internal.ModelViewer$LabelProvider.update(ModelViewer.java:487)
          ....