Fix bug

tests/utils/test_vobject.py

@@ -93,3 +93,45 @@ def test_multiline_uid():
          u' efgh\r\n'
          u'END:FOO\r\n')
     assert vobject.Item(a).uid == u'123456789abcdefgh'
+
+def test_multiline_uid_complex():
+    a = u'''
+BEGIN:VCALENDAR
+BEGIN:VTIMEZONE
+TZID:Europe/Rome
+X-LIC-LOCATION:Europe/Rome
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART:20140124T133000Z
+DTEND:20140124T143000Z
+DTSTAMP:20140612T090652Z
+UID:040000008200E00074C5B7101A82E0080000000050AAABEEF50DCF0100000000000000
+ 001000000062548482FA830A46B9EA62114AC9F0EF
+CREATED:20140110T102231Z
+DESCRIPTION:Test.
+LAST-MODIFIED:20140123T095221Z
+LOCATION:25.12.01.51
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Präsentation
+TRANSP:OPAQUE
+END:VEVENT
+END:VCALENDAR
+    '''.strip()
+    assert vobject.Item(a).uid == (u'040000008200E00074C5B7101A82E008000000005'
+                                   u'0AAABEEF50DCF0100000000000000001000000062'
+                                   u'548482FA830A46B9EA62114AC9F0EF')

vdirsyncer/utils/vobject.py

@@ -71,7 +71,7 @@ class Item(object):
         stack = [self.parsed]
         while stack:
             component = stack.pop()
-            if not component:
+            if component is None:
                 continue
             uid = component.get('UID', None)
             if uid: