fix: ssr TypeError: Cannot read property 'indexOf' of undefined

[jeffusion]

See this problem in issue: https://github.com/docsifyjs/docsify/issues/704

Summary

What kind of change does this PR introduce?

For any code change,

• [ ] Related documentation has been updated if needed
• [ ] Related tests have been updated or tests have been added

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and migration path for existing applications:

Related issue, if any:

Tested in the following browsers:

• [ ] Chrome
• [ ] Firefox
• [ ] Safari
• [ ] Edge
• [ ] IE

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[xiao99xiao]

@trusktr @Koooooo-7 May I ask what is the status of this PR? Since it resolves a major issue that blocks the usage of SSR, I really hope it could be merged soon.

[Koooooo-7]

@xiao99xiao Cause the SSR refactor has not set in place yet, it may be late to merge.

@trusktr do u think we could merge it as a patch for current SSR solution?

cc @docsifyjs/reviewers

[trusktr]

Yeah, this is already fixed in my work. SSR is working, but not all things work yet. Namely we still need some special handling for plugins. Another issue I have is I haven't installed a VM for testing, the tests don't pass in my native OS. I will circle back again soon, i haven't forgotten!

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[jeffusion]

related pr

[sy-records]

see #2105