Allow LockFileValidator results to carry multiple messages, and improve their text

I am not sure about the Lock file was absent at the start of stage operation. error message.
The main reason we get this error is: Lock file was not present at the start of stage operation and hence it was not able to store that hash and we can't retrieve it. If we don't want to talk about the hashes this message can be same as the message above it(The active lock file does not exist.).

reviewing

just one more nit

Looking good 👍

A couple of very minor nitpicks, but mostly non-blocking questions. This looks really good to me.

phenaproxima → closed merge request !106

Looks great to me!

This just needs a follow-up to improve the wording of the messages, linked in a @todo. Then it would be my pleasure to commit this.

Added @todo as requested!

🎉🎉

LGTM! 😊

And the follow-up was created, so removing tag 👍

Automatically closed - issue fixed for 2 weeks with no activity.