Fix configmap display chaos

[tosone]

What this PR does / why we need it:

在部署完成之后由于 configmap 中的一些值为空，使得 configmap 中的格式变得很混乱，导致无法正常查看。 这里将值为空的值不再渲染。

目前部署完成之后的效果如下：

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [ ] Chart Version bumped
• [ ] Variables are documented in the README.md
• [ ] Title of the PR starts with chart name (e.g. [mychartname])
• [ ] PR only contains changes for one chart

[sre-ci-robot]

Welcome @tosone! It looks like this is your first PR to zilliztech/milvus-helm 🎉

[tosone]

@LoveEachDay PTAL

[haorenfsa]

Hi @tosone, I'm confused about what the issue is. Is the snapshot you provided before the change or after the change? If is before, then it looks fine to me.

By the way, fields in .Values.externalS3.xxx should be kept.

[tosone]

Before:

After:

[haorenfsa]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haorenfsa, tosone

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/zilliztech/milvus-helm/blob/master/OWNERS)~~ [haorenfsa] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[haorenfsa]

It's good to merge, thank you @tosone !

[haorenfsa]

/lgtm