[smuxi/stable] Engine-XMPP: fix potential NRE in XmppProtocolManager.OnGroupChatPresenceError()

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit c69ef66e7cb7724c7cecaee1c1fc259f00a234e7
Author: Mirco Bauer <meebey meebey net>
Date:   Sat Feb 13 13:49:59 2016 +0100

    Engine-XMPP: fix potential NRE in XmppProtocolManager.OnGroupChatPresenceError()
    
    If pres.Error is null it will lead to a NRE in the switch statement.

 .../Protocols/Xmpp/XmppProtocolManager.cs          |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/Engine-XMPP/Protocols/Xmpp/XmppProtocolManager.cs 
b/src/Engine-XMPP/Protocols/Xmpp/XmppProtocolManager.cs
index 5b1367a..8006c3c 100644
--- a/src/Engine-XMPP/Protocols/Xmpp/XmppProtocolManager.cs
+++ b/src/Engine-XMPP/Protocols/Xmpp/XmppProtocolManager.cs
@@ -1920,6 +1920,7 @@ namespace Smuxi.Engine
             if (pres.Error == null) {
                 Session.AddMessageToChat(NetworkChat, msg);
                 Session.RemoveChat(chat);
+                return;
             }
             // is there an action we can do silently?
             switch (pres.Error.Type) {