mailchimp_campaign_send_campaign failed when status MAILCHIMP_STATUS_SENDING

For some reason when creating campaigns using mailchimp_campaign_send_campaign() the call to getCampaign() reported the status as MAILCHIMP_STATUS_SENDING rather than MAILCHIMP_STATUS_SENT, and this caused the function to report the send had failed failed when in fact it hadn't.

I changed

if ($campaign->status == MAILCHIMP_STATUS_SENT) {
to
if ($campaign->status == MAILCHIMP_STATUS_SENT || $campaign->status == MAILCHIMP_STATUS_SENDING) {

to work around this.

Does it make sense, and is MAILCHIMP_STATUS_SENDING an OK status at that point?