fix(config): Cannot read property 'canDisableScroll' of undefined in unit tests

Author: manucorporat

src/components/app/app.ts

@@ -71,7 +71,7 @@ export class App {
     // listen for hardware back button events
     // register this back button action with a default priority
     _platform.registerBackButtonAction(this.navPop.bind(this));
-    this._canDisableScroll = this._config.get('canDisableScroll', true);
+    this._canDisableScroll = _config.get('canDisableScroll', true);
   }
 
   /**

src/config/config.ts

@@ -127,7 +127,7 @@ import { isObject, isDefined, isFunction, isArray } from '../util/util';
 **/
 export class Config {
   private _c: any = {};
-  private _s: any;
+  private _s: any = {};
   private _qp: QueryParams;
   private _modes: any = {};
   private _trns: any = {};