[Bug]: NodeInfo implementation doesn't meet the 2.0 specification

[MV-GH]

Requirements

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Summary

Lemmy's NodeInfo implementation doesn't meet the requirements of the NodeInfo 2.0 specification.

• Specification doesn't allow any of the fields to be null.
• Protocol field must contain at least one entry. (For private instances this is null)

See
http://nodeinfo.diaspora.software/docson/index.html#/ns/schema/2.0#$$expand

Steps to Reproduce

N/A

see current implementation https://github.com/LemmyNet/lemmy/blob/b152be79516adbd542d766df7b8a1928da590ced/crates/routes/src/nodeinfo.rs

Technical Details

This broke Sign in of private Lemmy instances in Jerboa see LemmyNet/jerboa#1487

Version

0.19.4

Lemmy Instance URL

No response