removing appending warning to dom

src/plugins/jquery.flot.pie.js

@@ -327,7 +327,9 @@ More detail and specific examples can be found in the included HTML file.
 
             if (attempts >= REDRAW_ATTEMPTS) {
                 clear();
-                target.prepend("<div class='error'>Could not draw pie with labels contained inside canvas</div>");
+                if ( typeof console === 'object' && typeof console.warn === 'function' ) {
+                    console.warn("Could not draw pie with labels contained inside canvas");
+                }
             }
 
             if (plot.setSeries && plot.insertLegend) {