Bugfix: fixed an issue that could cause NPE to be thrown, when somehow object or skeleton animation maps were null.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@11000 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/blender/com/jme3/asset/BlenderKey.java

@@ -553,6 +553,9 @@ public class BlenderKey extends ModelKey {
         oc.write(skyGeneratedTextureShape, "sky-generated-texture-shape", SkyGeneratedTextureShape.SPHERE);
         oc.write(optimiseTextures, "optimise-textures", false);
 
+        if (nodeAnimationMap == null) {
+            oc.write(0, "node-anims-map-size", 0);
+        } else {
             oc.write(nodeAnimationMap.size(), "node-anims-map-size", 0);
             int counter = 0;
             for (Entry<String, List<String>> entry : nodeAnimationMap.entrySet()) {
@@ -560,15 +563,20 @@ public class BlenderKey extends ModelKey {
                 oc.write(entry.getValue().toArray(new String[entry.getValue().size()]), "node-anims-" + counter, null);
                 ++counter;
             }
+        }
 
+        if (skeletonAnimationMap == null) {
+            oc.write(0, "skeleton-anims-map-size", 0);
+        } else {
             oc.write(skeletonAnimationMap.size(), "skeleton-anims-map-size", 0);
-        counter = 0;
+            int counter = 0;
             for (Entry<String, List<String>> entry : skeletonAnimationMap.entrySet()) {
                 oc.write(entry.getKey(), "skeleton-anim-" + counter, null);
                 oc.write(entry.getValue().toArray(new String[entry.getValue().size()]), "skeleton-anims-" + counter, null);
                 ++counter;
             }
         }
+    }
 
     @Override
     public void read(JmeImporter e) throws IOException {