fix: 修复custom的异常输出

[eryajf]

未做空配置判断，导致有异常输出。

#29

Summary by CodeRabbit

• 文档

  • 在文档中新增对“自定义记录”DNS服务商的支持说明，并将其添加到支持列表中。

• 优化

  • 优化自定义记录证书信息指标的收集逻辑，仅在存在自定义记录时才进行相关操作。

[coderabbitai]

"""

Walkthrough

本次变更在文档中新增了“Custom Records”作为受支持的 DNS 服务商条目，并在代码中为自定义记录的证书信息指标采集增加了条件判断，仅在有自定义记录时才进行相关操作，遇错时提前返回。

Changes

文件/分组	变更摘要
README-en.md, README.md	在受支持的 DNS 服务商列表顶部新增“Custom Records”条目，并标记为已支持。
pkg/export/export_gauge.go	增加条件判断，仅在 CustomRecords 非空时才采集相关证书信息指标，遇错误时提前返回。

Poem

兔子挥笔写新篇，
DNS 伙伴添一员。
Custom Records 上榜前，
代码守门更周全。
跳跃更新乐无边，
指标采集更省电！ 🐇✨
"""

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a922cba and ee8caa4.

📒 Files selected for processing (1)

• pkg/export/export_gauge.go (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• pkg/export/export_gauge.go

✨ Finishing Touches

• 📝 Generate Docstrings

---

🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

• Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  • I pushed a fix in commit <commit_id>, please review it.
  • Explain this complex logic.
  • Open a follow-up GitHub issue for this discussion.
• Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query. Examples:
  • @coderabbitai explain this code block.
  • @coderabbitai modularize this function.
• PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  • @coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
  • @coderabbitai read src/utils.ts and explain its main purpose.
  • @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.
  • @coderabbitai help me debug CodeRabbit configuration file.

Support

Need help? Create a ticket on our support page for assistance with any issues or questions.

Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments.

CodeRabbit Commands (Invoked using PR comments)

• @coderabbitai pause to pause the reviews on a PR.
• @coderabbitai resume to resume the paused reviews.
• @coderabbitai review to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
• @coderabbitai full review to do a full review from scratch and review all the files again.
• @coderabbitai summary to regenerate the summary of the PR.
• @coderabbitai generate docstrings to generate docstrings for this PR.
• @coderabbitai generate sequence diagram to generate a sequence diagram of the changes in this PR.
• @coderabbitai resolve resolve all the CodeRabbit review comments.
• @coderabbitai configuration to show the current CodeRabbit configuration for the repository.
• @coderabbitai help to get help.

Other keywords and placeholders

• Add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
• Add @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
• Add @coderabbitai anywhere in the PR title to generate the title automatically.

CodeRabbit Configuration File (.coderabbit.yaml)

• You can programmatically configure CodeRabbit by adding a .coderabbit.yaml file to the root of your repository.
• Please see the configuration documentation for more information.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

Documentation and Community

• Visit our Documentation for detailed information on how to use CodeRabbit.
• Join our Discord Community to get help, request features, and share feedback.
• Follow us on X/Twitter for updates and announcements.

[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (1)

pkg/export/export_gauge.go (1)

164-165: 条件判断粒度 OK，但可读性小改进

len(public.Config.CustomRecords) != 0 能够精准过滤空配置；
通常 Go 社区更偏好 “早返回” 写法，可将整个块抽成私有函数 c.collectCustomCerts()，主流程更加清晰。

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2056f12 and a922cba.

📒 Files selected for processing (3)

• README-en.md (1 hunks)
• README.md (1 hunks)
• pkg/export/export_gauge.go (1 hunks)

🔇 Additional comments (2)

README.md (1)

136-136: 文档同步 👍

已将 “Custom Records” 标注为已支持，保持与代码实现一致。

README-en.md (1)

134-134: Docs updated consistently

英文文档亦同步新增 “Custom Records”，保持多语言一致性。