init command causes other party's client to hang when issued consecutively.

[dehekkendekrekker]

When two parties want to set up a secure line of communication using the irssi-otr plugin, party A initializes the process with the /otr init command.

When the party B does not have a key for party A, it will generate a key for comms with party A. This may take a while, but client B is still responsive.

When, in the mean time, party A issues the same command again, client B will become unresponsive until key generation is complete.

To Reproduce:
Start irssi, this will be client A
A: issue the command /connect irc.oftc.net
A: upon connection, issue the command /nick NICKA

Start irssi, this will be client B
B: issue the command /connect irc.oftc.net
B: upon connection, issue the command /nick NICKB

A: /load otr
B: /load otr
A: /msg message
A: from the private window with B, /otr init
B: should still be responsive, status window states key is being generated for NICKB@irc.oftc.net
A: from the private window with B, /otr init
B: now client B will be unresponsive until key generation is complete

[dehekkendekrekker]

This issue appears to be related to:
#24