Merge pull request #15062 from alexanderzobnin/fix-piechart

fix multiple piechart instances bug

public/vendor/flot/jquery.flot.pie.js

@@ -73,6 +73,7 @@ More detail and specific examples can be found in the included HTML file.
 			centerLeft = null,
 			centerTop = null,
 			processed = false,
+			options = null,
 			ctx = null;
 
 		// interactive variables