add /msg to criteria of active participants

[ppca]

added test_empty_msg() in the logic of establishing active participants.
Now to qualify as an active participant:

1. /state returns response fine;
2. sending empty message thru send_encrypted() returns Ok(());

[ailisp]

Looks good to me. How is empty message handled btw? If it's considered an error we may handle it as a proper status checking request

[ChaoticTempest]

let's rename this to send_empty_msg instead since we should reserve test_* functions for testing purposes

[ChaoticTempest]

Seems like all the recent PRs are running into this issue:

Error: Action #0: CompilationError(PrepareError(Deserialization))

I've tried compiling and running tests on a linux machine and they pass so not sure what's going on here. Could be a caching issue

[volovyks]

@ailisp can you please clean our cache?

[ppca]

Looks good to me. How is empty message handled btw? If it's considered an error we may handle it as a proper status checking request

looking at

mpc/chain-signatures/node/src/web/mod.rs

Line 78 in ecc6fd3

for encrypted in encrypted.into_iter() {

, the empty message will just return Ok(()) and not do anything else.

[ailisp]

@volovyks done