Fix IllegalStateException.

The pager must be notified of changes in its underlying data.

JIRA:CYAN-1703
Change-Id: I473e03e546665f5a159e2af43b389c0d83dc9928
Merge "Fix IllegalStateException." into cm-10.1
Merge branch 'cm-10.1' of https://github.com/CyanogenMod/android_packages_apps_Mms into jellybean-legacy