[folks] Update for 142f9b74: make Individual.calendar_event_id nullable

[Travis Reitter <treitter src gnome org>]

commit a69aa8ce9b38401b8944dd4077ede6cb2ed1afb8
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Thu Jul 21 09:41:58 2011 -0700

    Update for 142f9b74: make Individual.calendar_event_id nullable

 folks/individual.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/folks/individual.vala b/folks/individual.vala
index 8cdb9dd..435a299 100644
--- a/folks/individual.vala
+++ b/folks/individual.vala
@@ -404,7 +404,7 @@ public class Folks.Individual : Object,
 
   public DateTime birthday { get; set; }
 
-  public string calendar_event_id { get; set; }
+  public string? calendar_event_id { get; set; }
 
   private HashSet<Note> _notes;
   private Set<Note> _notes_ro;