Fix NPE from monkey run

    private TextView mProxyPortView;

    private TextView mProxyExclusionListView;

    private IpAssignment mIpAssignment;

    private ProxySettings mProxySettings;

    private IpAssignment mIpAssignment = IpAssignment.UNASSIGNED;

    private ProxySettings mProxySettings = ProxySettings.UNASSIGNED;

    private LinkProperties mLinkProperties = new LinkProperties();

    // True when this instance is used in SetupWizard XL context.