Core fix/multi series fix (#47)

* Added patch fix for multi series chart error

* Cleaned up code

* Removed test codes

* Added check for FC library

* Fixed datasource and dataSource conflict

Author: rohanoid5

component/index.js

@@ -150,7 +150,7 @@ export default (FC, ...options) => {
             // SPECIAL CASE: When DataSource has series attribute, vue internally goes into Infinite recursion
             // specifically on _traverse method. This code is written to tackle that issue. In future a much more
             // concrete solution is required.
-            if (this.datasource.series) {
+            if (this.datasource && this.datasource.series) {
               const _FC_ = _FC || window.FusionCharts;
               const data = JSON.parse(JSON.stringify(newVal._data));
               const schema = JSON.parse(JSON.stringify(newVal._schema));
@@ -180,10 +180,11 @@ export default (FC, ...options) => {
       'dataSource.data': {
         handler: function(newVal, prevVal) {
           if (newVal !== prevVal) {
-            if (this.datasource.series) {
+            if (this.dataSource && this.dataSource.series) {
+              const _FC_ = _FC || window.FusionCharts;
               const data = JSON.parse(JSON.stringify(newVal._data));
               const schema = JSON.parse(JSON.stringify(newVal._schema));
-              const dataTable = new _FC.DataStore().createDataTable(
+              const dataTable = new _FC_.DataStore().createDataTable(
                 data,
                 schema
               );