Account "" is shown in listaccounts but cannot be used for move/transaction

Account "" is shown in listaccounts. But trying to use it with nyx-cli for commands like:
$> nyx-cli getaccountaddress ""

or trying to use it as source/target for:
$> nyx-cli move [from-account] [to-account]

ends up with a Deprecation-Notice.

In my case this was a real problem while I screwed up my local wallet like described here #1.