Describe the bug

To Reproduce
Steps to reproduce the behavior:

1. The server needs to be started with --auth enabled.
2. Pass something to -D/--Database.
3. Provide a database.lua. See manual.
4. In the server console, enter: fcdb lua This is fine.
5. Observe crash.

Expected behavior
A clear and concise explanation of why this is NOT fine to write in Lua, and the server keeps running.

Console logs

> fcdb lua This is fine.
[sol2] An error occurred and has been passed to an error handler: sol: syntax error: [string " This is fine."]:1: syntax error near 'is'
terminate called after throwing an instance of 'sol::error'
  what():  sol: syntax error: [string " This is fine."]:1: syntax error near 'is'

Platform and version (please complete the following information):

• OS: Debian
• Freeciv21 version: 3.2-dev (f2eca12)
• Ruleset/Longturn game (if applicable): CTF

Additional context
Discussion on discord