ScreenManager does not reinitialize SoftButton ID Sets on reconnection

[renonick87]

Bug Report

When the library disconnects from core, the ScreenManager sets the _softButtonIDBySoftButtonManager and _softButtonIDByAlertManager to null, but these Sets are not reinitialized on reconnection. This causes errors in the library from trying to call Set methods on a null value.

Reproduction Steps

1. Connect and disconnect an app by sending RegisterAppInterface and UnregisterAppInterface RPCs.
2. Reconnect the app with a RegisterAppInterface.
3. Display a list of SoftButtonObjects with the ScreenManager's setSoftButtonObjects method.

screenManager.setSoftButtonObjects([softButtonObject1, softButtonObject2, softButtonObject3]);

Expected Behavior

The SoftButtons are displayed in the HMI.

Observed Behavior

The SoftButtons are not displayed in the HMI and error is logged from the library.

Browser & Version Information

• SDL JavaScript Suite Module: node
• SDL JavaScript Version: v1.5.0 RC
• Testing Against: Manticore v2.8.0

[theresalech]

Closed via #502