Fix mapValueCalculation in tooltip

src/chart/map/MapSeries.js

@@ -105,6 +105,12 @@ define(function (require) {
             }
         },
 
+        getRawValue: function (dataIndex) {
+            // Use value stored in data instead because it is calculated from multiple series
+            // FIXME Provide all value of multiple series ?
+            return this._data.get('value', dataIndex);
+        },
+
         /**
          * Map tooltip formatter
          *