eip: wrong usage of p.cmdline with psutil 2.1.1

When starting eip on the debian rc, I get this cryptic error that avoids eip from starting:

2014-05-19 17:04:19 samsara leap.bitmask.services.eip.eipbootstrapper[22573] DEBUG Downloading EIP client certificate for dev.bitmask.net
2014-05-19 17:04:19 samsara leap.bitmask.gui.statemachines[22573] DEBUG State Encrypted Internet::connecting entered. Emitting signal ...
2014-05-19 17:04:19 samsara leap.bitmask.services.eip.vpnprocess[22573] DEBUG VPN: start
2014-05-19 17:04:19 samsara leap.bitmask.backend[22573] ERROR Unexpected problem: TypeError('argument 2 to map() must support iteration',)

*(from redmine: created on 2014-05-19, closed on 2014-05-21, relates #5610)*