[hotfix] Still do remove server tag if tablet server not exist

[zcoo]

Search before asking

• I searched in the issues and found nothing similar.

Fluss version

0.9.0 (latest release)

Please describe the bug 🐞

Before rebalancing, we need to tag TabletServers.

After rebalancing, we do remove tag.

If the tablet server does not exists afterwards, the remove tag request will throw a exception.

Solution

We expect not throw a exception but execute the request normally.

Are you willing to submit a PR?

• I'm willing to submit a PR!