Fix a StaleDataException issue when pressed MENU in busy
Fix a StaleDataException issue when pressed MENU in busy

Need to check the state before got the count of mCursor,
since it will be closed in refeshing the list.

Change-Id: Ib636fd8802ced47c6b30fa4cb6fde8173386dd7b
Signed-off-by: Roger Chen <978f296cd7dd9dd5e3d0b6fa935716127e021333@gmail.com>

bmaupin/android-sms-plus