fix(cluster_info): fix error for hosts/disks/statistics page

[baurine]

This PR fixes the following error pages:

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 23.68%. Comparing base (c32ca0c) to head (3b9def8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1664 +/- ## =========================================== + Coverage 8.99% 23.68% +14.68% =========================================== Files 131 177 +46 Lines 13704 16055 +2351 =========================================== + Hits 1233 3802 +2569 + Misses 12338 11968 -370 - Partials 133 285 +152 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1664/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [backend_integration](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1664/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `8.98% <0.00%> (-0.01%)` | :arrow_down: | | [backend_ut](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1664/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `26.19% <ø> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more. ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1664?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1664?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap). Last update [c32ca0c...3b9def8](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1664?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap).

[ti-chi-bot[bot]]

@mornyx: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to [this](https://github.com/pingcap/tidb-dashboard/pull/1664#pullrequestreview-1960154744): > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[ti-chi-bot[bot]]

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