ShortcutInfo: Don't assume all stringified items have a title

Changes to some activities (some removals due to missing apps
or layout changes, for instance) result in icon updates for
items without a title. Attempting to stringify the item object
in order to log the update and assuming a title was present
was resulting in a NPE

Change-Id: I414bbb7feaf41d13a82c630a5652a3833b12a2fc
Merge "ShortcutInfo: Don't assume all stringified items have a title" into cm-10.1