[Merge] lp:~phablet-team/messaging-app/mms_settings into lp:messaging-app/staging

[Roberto Mier Escandón ]

Review: Needs Information

Now the setting remains enabled and I can create a MMS group. But I have seen another thing, maybe not related. If I don't send any MMS in the group and go back to conversations list, there is no related thread to it and therefor I cannot re-enter in the thread.
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https://code.launchpad.net/~phablet-team/messaging-app/mms_settings/+merge/310582
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