Fix warning "Impossible to log"

David Faurerequested to merge
wip/dfaure/warning-impossible-to-log into master

WARNING: Impossible to log: mRocketChatAccount->serverVersion().isEmpty() true mRocketChatAccount->password().isEmpty() false isn't an error. It's just that we are waiting for the server version to be retrieved. Improve the text to be more readable and downgrade to qCDebug.

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