A Segmentation fault occurs in Debian 7 when pressing the Remove button

[Antaon]

Specs: Torsion v1.0.0-10-g2c52502 on Debian 7 (64bit) in VirtualBox:

Repro Steps:

1. Open the Torsion binary and successfully connect to the Tor network.
2. Click the "Torsion Preferences"
3. When you have no contacts press the "Remove" button.

Results: The Torsion binary crashes (terminal crash output provided below).

Expected Result: System does nothing if no contacts are available. System continues without critical error.

Terminal output:
#user runs "./Torsion" from terminal while in the path with the binary.
OpenGL Warning: Failed to connect to host. Make sure 3D acceleration is enabled for this VM.
qrc:/ui/MainWindow.qml:92:5: QML Loader: Binding loop detected for property "active"
#user clicks the "Torsion Preferences"
qrc:/ui/ContactPreferences.qml:42: TypeError: Cannot read property 'nickname' of null
qrc:/ui/ContactPreferences.qml:51: TypeError: Cannot read property 'contactID' of null
qrc:/ui/ContactPreferences.qml:58: TypeError: Cannot call method 'readSetting' of null
qrc:/ui/ContactPreferences.qml:67: TypeError: Cannot call method 'readSetting' of null
#user clicks the "Remove" button.
qrc:/ui/MessageDialogWrapper.qml:4:1: Type MessageDialog unavailable
qrc:/QtQuick/Dialogs/WidgetMessageDialog.qml:42:1: module "QtQuick.PrivateWidgets" is not installed
Segmentation fault
#end of crashlog.

Notes:
Note that this same crash also occurs if the binary is run from GUI as opposed to terminal.

[special]

The crash, warnings, and useless empty UI fields are fixed by the commit, but there is another bug here, in that the QtQuick.PrivateWidgets module didn't get bundled.

Thanks