When trying to convert a private group to a public group, if you do not set a public link and tap on the top right checkmark, you'll see no errors and will go to the previous page.
Steps to reproduce:
Open a private group and go to the group settings > Group Type.
Select "Public Group" option.
DO NOT set a public link.
Tap on the checkmark in the top right to save.
Current result:
You'll go back to the group settings with no errors (user may think that they successfully converted the group to a public one, but it's still a private group).
Expected result:
The empty link field should shake and the phone should vibrate (just like when you leave other fields empty).
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