save signals 'events' field when a signals experiment ends on error

[jkbhagatio]

maybe add exception handling to exp.SignalsExp/mainLoop ?

[k1o0]

This is already the case. Perhaps you could replicate the problem? If not then please close the issue.

[jkbhagatio]

No, this has happened to both Tim and Anna this past week due to errors updating signals in their exp defs during runtime. I'll look more into possible solutions