NPE when using Static Icons in the MenuManager

[jacobkeeler]

Bug Report

When attempting to use a Static Icon via the MenuManager, a NullPointerException occurs with the following stack trace:

2019-10-08 16:57:10.121 16451-16451/io.livio.sdltestsuite.app1 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: io.livio.sdltestsuite.app1, PID: 16451
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.smartdevicelink.proxy.rpc.enums.FileType.equals(java.lang.Object)' on a null object reference
        at com.smartdevicelink.managers.file.filetypes.SdlArtwork.setType(SdlArtwork.java:114)
        at com.smartdevicelink.managers.file.filetypes.SdlArtwork.clone(SdlArtwork.java:167)
        at com.smartdevicelink.managers.screen.menu.MenuCell.clone(MenuCell.java:336)
        at com.smartdevicelink.managers.screen.menu.BaseMenuManager.cloneMenuCellsList(BaseMenuManager.java:1339)
        at com.smartdevicelink.managers.screen.menu.BaseMenuManager.setMenuCells(BaseMenuManager.java:172)
        at com.smartdevicelink.managers.screen.menu.MenuManager.setMenuCells(MenuManager.java:45)
        at com.smartdevicelink.managers.screen.BaseScreenManager.setMenu(BaseScreenManager.java:429)
        at com.smartdevicelink.managers.screen.ScreenManager.setMenu(ScreenManager.java:45)

Related #848

Reproduction Steps

1. Attempt to create a menu item with a static icon

Expected Behavior

The provided static icon appears in the HMI next to the specified menu item

Observed Behavior

App crashes with NullPointerException

OS & Version Information

• Android Version: 9, Pixel 11 Emulator
• SDL Android Version: develop branch
• Testing Against: Core develop branch & Generic HMI develop branch

Test Case, Sample Code, and / or Example App

        final MenuCell A = new MenuCell("A", new SdlArtwork(StaticIconName.ACCEPT_CALL), null, new MenuSelectionListener() {
            @Override
            public void onTriggered(TriggerSource trigger) {
                messageLogger.logInfo(TAG, "A Triggered", true);
            }
        });
        
        sdlManager.getScreenManager().setMenu(Arrays.asList(A));