Complete result of getBoxes()

When I run LIST on my IMAP server, I get something like this:

. LIST "" "*"
...
* LIST (\HasNoChildren) "." "INBOX.archiv.inbox2005"
* LIST (\HasNoChildren) "." "INBOX.archiv.inbox2006"
* LIST (\HasNoChildren) "." "INBOX.archiv.inbox2007"
* LIST (\HasNoChildren) "." "INBOX.archiv.inbox2009"
* LIST (\HasChildren) "." "INBOX.archiv"
...

The current implementation overwrites the "INBOX.archiv.inbox..."
boxes as soon as "INBOX.archiv" is processed.

This is a small fix to make sure that the previously processed
boxes are not overwritten.

imap.js

@@ -369,7 +369,9 @@ ImapConnection.prototype.connect = function(loginCb) {
               }
               box.parent = parent;
             }
-            curChildren[name] = box;
+            if ( ! curChildren[name] ) {
+              curChildren[name] = box;
+            }
           }
         break;
         default: