fix initial conversation attachment sending, closes #5606
fix initial conversation attachment sending, closes #5606

Change-Id: I045c17f307f91a9e4efc11d01499ad6b6bb10b70
Reviewed-on: https://gerrit.instructure.com/5749
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>

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