[folks] Check FieldDetails values before storing to avoid segfaults.

[Travis Reitter <treitter src gnome org>]

commit a69d0fcecc75040aae0276723db99375f58bebbf
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Thu Mar 3 09:47:22 2011 -0800

    Check FieldDetails values before storing to avoid segfaults.
    
    This protects against backends storing some bogus data in their Personas (in
    this case, value-less URL, Phone Number, or Email Address fields).

 folks/individual.vala |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/folks/individual.vala b/folks/individual.vala
index e2e5bca..cbbb15f 100644
--- a/folks/individual.vala
+++ b/folks/individual.vala
@@ -1044,6 +1044,9 @@ public class Folks.Individual : Object,
             {
               foreach (unowned FieldDetails ps in urlable.urls)
                 {
+                  if (ps.value == null)
+                    continue;
+
                   var existing = urls_set.lookup (ps.value);
                   if (existing != null)
                     existing.extend_parameters (ps.parameters);
@@ -1080,6 +1083,9 @@ public class Folks.Individual : Object,
             {
               foreach (unowned FieldDetails fd in phoneable.phone_numbers)
                 {
+                  if (fd.value == null)
+                    continue;
+
                   var existing = phone_numbers_set.lookup (fd.value);
                   if (existing != null)
                     existing.extend_parameters (fd.parameters);
@@ -1106,6 +1112,9 @@ public class Folks.Individual : Object,
             {
               foreach (unowned FieldDetails fd in emailable.email_addresses)
                 {
+                  if (fd.value == null)
+                    continue;
+
                   var existing = emails_set.lookup (fd.value);
                   if (existing != null)
                     existing.extend_parameters (fd.parameters);