`DemoPlugin` crashes app when no demo is available.

[waynemwashuma]

System information.

Commit hash: 8c53244

Description.

When there is no demo provided to the DemoPlugin or in the DemoList resource, the app will crash.

Steps to reproduce.

1. Create an app.
2. register DemoPlugin with no demos.

Expected behaviour.

The app should run normally.

Actual behaviour.

The app crashes with error:
undefined is not iterable (cannot read property Symbol(Symbol.iterator))

Cause(s).

The initDemo() system is reading an undefined value at the start of the demo list as no demo is inside it.

[waynemwashuma]

Solution

Handle the case inside initDemo() system when there is no demo in the demo list.