Improve error message when shader uniform is not set

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10650 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/android/com/jme3/renderer/android/OGLESShaderRenderer.java

@@ -678,7 +678,8 @@ public class OGLESShaderRenderer implements Renderer {
         }
 
         if (uniform.getVarType() == null) {
-            logger.warning("value is not set yet.");
+            logger.log(Level.WARNING, "Uniform value is not set yet. Shader: {0}, Uniform: {1}",
+                    new Object[]{shader.toString(), uniform.toString()});
             return; // value not set yet..
         }