User notifications message settings at user/[uid]/settings are not honored after saving

It seems that after a user removes a message type in the notifications message section for a space that users still receive emails of that type.

This is easily tested by removing the updated type for a user and then updating any node in a space and selecting to notify that user. They will still receive an email notifying them of the updated node even though they have selected not to.

I tracked this down to an oversight in

oa_messages.module
line 195 in oa_messages_determine_user_notifiers function

 // Otherwise, check if the specific message type is enabled for the space
    elseif (isset($settings[$space_id]['messages'][$message->type])) {

If the user has saved settings the $message->type will exist and be set to 0
a simple fix is to add a test for the empty state

// Otherwise, check if the specific message type is enabled for the space
    elseif (isset($settings[$space_id]['messages'][$message->type]) && !empty($settings[$space_id]['messages'][$message->type])) {

As far as I can tell this issue is still present in all versions of oa although I am only testing on 7.x-2.33

Thanks