Fix for method that checks if the mesh is a B-Mesh or not.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9719 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/blender/com/jme3/scene/plugins/blender/meshes/MeshHelper.java

@@ -253,7 +253,7 @@ public class MeshHelper extends AbstractBlenderHelper {
     private boolean isBMeshCompatible(Structure meshStructure) {
     	Pointer pMLoop = (Pointer) meshStructure.getFieldValue("mloop");
 		Pointer pMPoly = (Pointer) meshStructure.getFieldValue("mpoly");
-		return pMLoop != null && pMPoly != null;
+		return pMLoop != null && pMPoly != null && pMLoop.isNotNull() && pMPoly.isNotNull();
     }
     
 	/**