Page fails if no guesses available

[teptec]

I'll leave this system in the state which breaks the page:
https://canonn-science.github.io/canonn-signals/index.html?system=660485314065

There are 9 bodies in the system. Three have biological signals.

I FSS'd the system then viewed the page. No potential biologicals were shown.
I then DSS'd body 3.
At this point the json for the system indicated one unknown biological signal on the planet and no guesses available:

On loading the page, console reported error, called sort on undefined:

That would be this code:

(I guess this is a side effect of reducing the number of false positives!)

[Elfener99]

This commit should fix it. Going to leave this issue open in case I broke something else with it though.