fixes #5116 fixes percentages in chart tooltips are sometimes 0% alth…

…ough they should not. Happened when there was a value 0 in value[1] meaning there was no data for one of the points. In such a case sum was the value of the concatenated array such as "0-5:3,5-10:10,...

plugins/CoreVisualizations/javascripts/jqplot.js

@@ -125,7 +125,7 @@
                 $.each(series, function(index, value) {
                     if ($.isArray(value) && value[1]) {
                         sum = sum + value[1];
-                    } else {
+                    } else if (!$.isArray(value)) {
                         sum = sum + value;
                     }
                 });