[Vobject] [BUG] obj.serialize() fails on CATEGORIES component

[Wilfredo Sánchez Vega]

   The iCalendar data below is emitted by Mozilla Sunbird.  vobject  
parses this fine, but raises when it tries to serialize it.

   I've narrowed this down to the CATEGORIES component.  Apparently,  
vobject keeps it's value in a list:

     >>> children[11]
     <CATEGORIES{}[u'Customer']>

   (children is the list of children hanging off of the VEVENT  
component.)

   When you try to serialize it, it raises:

     >>> children[11].serialize()
     Traceback (most recent call last):
       File "<stdin>", line 1, in ?
       File "/Users/wsanchez/Developer/Python/vobject/vobject/ 
vobject.py", line 159, in serialize
         out = self.behavior.serialize(transformed, buf, lineLength)
       File "/Users/wsanchez/Developer/Python/vobject/vobject/ 
behavior.py", line 129, in serialize
         return vobject.defaultSerialize(obj, buf, lineLength)
       File "/Users/wsanchez/Developer/Python/vobject/vobject/ 
vobject.py", line 673, in defaultSerialize
         if obj.behavior and not startedEncoded: obj.behavior.encode 
(obj)
       File "/Users/wsanchez/Developer/Python/vobject/vobject/ 
icalendar.py", line 746, in encode
         line.value = map(backslashEscape, line.value).join(',')
     AttributeError: 'list' object has no attribute 'join'

	-wsv



BEGIN:VCALENDAR
PRODID:-//Mozilla Calendar//NONSGML Sunbird//EN
VERSION:2.0
BEGIN:VEVENT
CREATED:20060111T165807Z
LAST-MODIFIED:20060111T165820Z
DTSTAMP:20060111T165807Z
UID:uuid1136998700639
SUMMARY:party
PRIORITY:0
STATUS:
CLASS:PUBLIC
DTSTART:20060111T100000
DTEND:20060111T110000
LOCATION:my pad
CATEGORIES:Customer
DESCRIPTION:woot!
END:VEVENT
END:VCALENDAR

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