fixed: check for undefined on freeLabels, if config missing, todo should include proper in config

Author: Andreas Müller

src/output/base.js

@@ -106,6 +106,9 @@ class base {
         let times = [];
 
         let spentFreeLabels = this.config.get('freeLabels');
+        if(undefined === spentFreeLabels) {
+            spentFreeLabels = [];
+        }
 
         ['issues', 'mergeRequests'].forEach(type => {
             this.report[type].forEach(issue => {