[bug]: Mailing Lists show incorrect member count

[dlrudie]

What happened?

When managing mailing lists the members count will show 1 if there are 0 members. All other member counts appear correct.

For example:
0 members = displays 1 member
1 member = displays 1 member
2 members = displays 2 members
3 members = displays 3 members

How can we reproduce the problem?

I can reproduce the problem by doing the following steps:
Creating a mailing list with no members
-or-
Edit an existing mailing list and remove all members

Version

v0.11.x

What database are you using?

FoundationDB

What blob storage are you using?

FoundationDB

Where is your directory located?

Internal

What operating system are you using?

Linux

Relevant log output

Code of Conduct

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