Chris Hill-Scott 5d5047fb13 Add unique constraint to email branding domains ...

Does two things:

1. Revert "Revert "Add unique constraint to email branding domain""

This reverts commit af9cb30ef3.

2. Don’t allow empty string in email branding domain

Columns with multiple `null`s can have a uniqueness constraint. Columns
with multiple empty string values are not considered unique.

This commit:
- removes any duplicate empty string values
- casts empty strings to null string any time these columns are updated

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Squashed into this single commits because these two things are not
atomic as individual commits.

2018-09-04 11:10:46 +01:00

578 B

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