Allow the position to be null.

Author: AlexIIL

src/main/java/alexiil/mc/mod/load/json/subtypes/JsonRenderImage.java

@@ -35,7 +35,7 @@ protected BakedRender actuallyBake(FunctionContext context) throws InvalidExpres
         NodeVariableDouble varWidth = context.putVariableDouble("elem_width");
         NodeVariableDouble varHeight = context.putVariableDouble("elem_height");
         INodeLong _colour = GenericExpressionCompiler.compileExpressionLong(colour, context);
-        BakedArea pos = position.bake(context);
+        BakedArea pos = (position == null ? new Area("0", "0", "screen_width", "screen_height") : position).bake(context);
         BakedArea tex;
         if (texture == null) {
             NodeConstantDouble zero = NodeConstantDouble.ZERO;