this fixes compat with lbry vault and some electrum clients that aren't expecting [''] on peer list, which is expected when federation is completely disabled.
Coverage increased (+0.08%) to 68.066% when pulling c2dcc4c8982b7ad3dca0a002a704fe0591eb8374 on vault_temp into d09bfdc4ffc7adf27f77bef1477904f779084167 on master.
this fixes compat with lbry vault and some electrum clients that aren't expecting
['']
on peer list, which is expected when federation is completely disabled.