fix: array to object check

Author: evenstensberg

lib/groups/config.js

@@ -117,7 +117,7 @@ class ConfigGroup extends GroupHelper {
             this.opts['options'] = newOptions;
         } 
         else {
-            if(!configOptions.length) {
+            if(Array.isArray(configOptions) && !configOptions.length) {
                 this.opts['options'] = {};
                 return;
             }