Bugfix: fixed a bug that caused NPE during vertex groups loading when

mesh block was saved without its parent.

jme3-blender/src/main/java/com/jme3/scene/plugins/blender/meshes/MeshHelper.java

@@ -286,6 +286,8 @@ public class MeshHelper extends AbstractBlenderHelper {
         List<Map<String, Float>> result = new ArrayList<Map<String, Float>>();
 
         Structure parent = blenderContext.peekParent();
+        if(parent != null) {
+        	// the mesh might be saved without its parent (it is then unused)
         	Structure defbase = (Structure) parent.getFieldValue("defbase");
             List<String> groupNames = new ArrayList<String>();
             List<Structure> defs = defbase.evaluateListBase();
@@ -312,6 +314,7 @@ public class MeshHelper extends AbstractBlenderHelper {
                     result.add(weightsForVertex);
                 }
             }
+        }
         return result;
     }