Small fix to name fetching from structure.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7601 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/blender/com/jme3/scene/plugins/blender/data/Structure.java

@@ -247,9 +247,13 @@ public class Structure implements Cloneable {
 	 * @return the name of the structure read from the ID field or null
 	 */
 	public String getName() {
-        Structure id = (Structure) this.getFieldValue("ID");
+		Object fieldValue = this.getFieldValue("ID");
+		if(fieldValue instanceof Structure) {
+			Structure id = (Structure)fieldValue;
 			return id == null ? null : id.getFieldValue("name").toString().substring(2);//blender adds 2-charactes as a name prefix
 		}
+		return null;
+	}
 	
     @Override
     public String toString() {