Handle more gracefully the case where a texture

directive has no image specified.  Prior to this
it was throwing an ArrayIndexOutOfBounds exception
which was silently swallowed even though the
import fails.

jme3-plugins/src/ogre/java/com/jme3/scene/plugins/ogre/MaterialLoader.java

@@ -159,6 +159,11 @@ public class MaterialLoader implements AssetLoader {
         String[] split = statement.getLine().split(" ", 2);
         String keyword = split[0];
         if (keyword.equals("texture")){
+            if (split.length < 2) {
+                logger.log(Level.WARNING, "Invalid texture directive, no image specified at [{0}]", 
+                                            statement.getLineNumber());
+                return;
+            }
             readTextureImage(split[1]);
         }else if (keyword.equals("tex_address_mode")){
             String mode = split[1];