Bug 976454 - [Sora][Message][MMS]The prompt message is wrong when re-enter message r=schung

When invoking an activity, we show the "no provider" message only when we
receive this specific error.
Merge pull request #16738 from julienw/976454-no-provider-error

Bug 976454 - [Sora][Message][MMS]The prompt message is wrong when re-ent...