Monkey-found NPE
Monkey-found NPE

Bug 5531640
Test for null working message before deref. The monkey can click on the
edit button and then the remove button before the edit click handler
can process editing the item (which has been removed).

Change-Id: I12e34de31a1a458c3f542b7016ac2c71dc43e827

bmaupin/android-sms-plus