refactor at app.js to remove troublesome console.log()

client/core/src/lib/app.js

@@ -8,10 +8,7 @@ import {module} from '../module';
  */
 export default class App {
     show(message) {
-        if (this.snackbar)
-            this.snackbar.show({message: message});
-        else
-            console.log(message);
+        if (this.snackbar) this.snackbar.show({message: message});
     }
     showMessage(message) {
         this.show(message);