Fix bug that allows mandatory fields to be hidden - Refer Saras work around

Please refer to Sara's post here for work around:

https://help.gocanvas.com/hc/en-us/community/posts/360030141334/comments/360005320434

Topic:

https://help.gocanvas.com/hc/en-us/community/posts/360030141334

In the absence of any other fix this would at least provide a work around.