[Pidgin] #15452: IRC SASL sends invalid commands for empty SASL data

[Pidgin]

#15452: IRC SASL sends invalid commands for empty SASL data
---------------------+-----------------
 Reporter:  grawity  |      Owner:  elb
     Type:  defect   |     Status:  new
Milestone:  2.10.7   |  Component:  IRC
  Version:  2.10.6   |   Keywords:
---------------------+-----------------
 In some cases, `sasl_client_step()` returns a zero-length response (for
 example, when using the EXTERNAL mechanism).

 When this happens, Pidgin sends `AUTHENTICATE` without any arguments and
 the server complains about "missing parameter". The correct way is to send
 a `+` as the data (i.e. `AUTHENTICATE +`).

 Patch attached...hopefully.

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Ticket URL: <https://developer.pidgin.im/ticket/15452>
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