Correct attachment type for Mms only has subject

Mark the attachment type of Mms only has subject as TEXT
avoid to show Mms View as untimely

Change-Id: I346ae4af4983e9e8dbe9533eeddef445affc339a
Signed-off-by: Roger Chen <cxr514033970@gmail.com>
avoid IllegalStateException in MessagingNotification

If columnIndex is -1, c.getLong(columnIndex) makes IllegalStatementException.
So, the columnIndex should be checked -1 or not before using.

Change-Id: Id0dfffa5159d22dc67d56003b999dce80378736e