fix for after-bolus crash #249
Merged
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Fixes #233
Multiple updates have the potential to interleave, due to being managed by dispatch_groups. Therefore two updates first read the state of the temp basal (e.g. both read nil), then when their async completion runs, the first one sets the temp basal to non-nil and the UITableView is fine, but then the second one also sets it to non-nil and attempts to insert an extra row in the table view.