[Gallery] Unable to launch Gallery app

krillin, rc-proposed, 15.04 (r90)

Steps to reproduce:

1. Tap on the Gallery app (via launcher / Apps scope)
2. Wait for it to launch

Actual behaviour: Gallery header and spinner are shown indicating that the app is launching, but then these elements disappear and user is presented with a entire white screen.

Expected behaviour: Gallery app to be launched.

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This is what the gallery log contains when I try to run the gallery app:

Loading module: 'libubuntu_application_api_touch_mirclient.so.3.0.0'
file:///usr/share/click/preinstalled/com.ubuntu.gallery/2.9.1.1209/rc/qml/GalleryApplication.qml:202:5: QML Binding: Binding loop detected for property "target"
file:///usr/share/click/preinstalled/com.ubuntu.gallery/2.9.1.1209/rc/qml/MainScreen.qml:310:9: Cannot assign object to list
UbuntuWindow - regular geometry
UbuntuWindow::handleSurfaceFocusChange(focused=true)
UbuntuWindow::handleSurfaceResize(width=540, height=919)
Opening ("/home/phablet/Pictures", "/home/phablet/Videos") ...
Opened ("/home/phablet/Pictures", "/home/phablet/Videos") 0 media files loaded in 7 ms - inf ms per media
UbuntuClipboard - Got invalid serialized mime data. Ignoring it.
libust[5483/5496]: Error: Error opening shm /lttng-ust-wait-5-32011 (in get_wait_shm() at lttng-ust-comm.c:958)
libust[5483/5495]: Error: Error opening shm /lttng-ust-wait-5 (in get_wait_shm() at lttng-ust-comm.c:958)