'Merge' two statuses. If either value passed is 'error', it will return 'error'. Else it will return 'success'.
Optional
The existing value to 'merge' with the new value.
The new value to 'merge' with the existing value
The 'merged' value.
'Merge' two statuses. If either value passed is 'error', it will return 'error'. Else it will return 'success'.