Fix NPE when trying to construct WorkspaceItemInfo with null intent data.

We change the way we parse the install queue; so this seems to be a rare case
when trying to flush an install queue from an old apk with a launcher apk
with the new parsing changes.

Bug: 140935140
Change-Id: I14db4c3f70ed2e1bc5ad31dec7e6473cd6f8f13c