Remove invalid expectation (beta)

[NikVolf]

#4420

code looks like a mess there, and invalid expect is like an icy on the cake

[rphmeier]

Build of rocksdb-sys failing with the gcc on the CI? @General-Beck

[General-Beck]

@rphmeier no, build succeful

[tomusdrw]

Can you elaborate why the expectation was incorrect? Seems that fn get always reads the account from cache, no?
So the only reason I see is that there is a race condition when trying to remove the same account twice, was there any other issue?

[NikVolf]

@tomusdrw
exactly this
with concurrent access the expectation can't be 100% correct, because there is no single lock

and ui/user might duplicate delete account request so that it results in a panic

[rphmeier]

@General-Beck this one looks pretty failed to me: https://gitlab.ethcore.io/parity/parity/builds/46155

[arkpar]

I thought we don't support armv6. Where's the PR check for that target coming from?

[NikVolf]

test fail is unrelated to the pr