[evolution] Add e_mail_part_has_validity().

[Matthew Barnes <mbarnes src gnome org>]

commit 543b4d932102206527f42c7a2d1bf049a4b2415d
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sun May 19 12:25:43 2013 -0400

    Add e_mail_part_has_validity().

 em-format/e-mail-formatter-print-headers.c |    2 +-
 em-format/e-mail-part.c                    |    9 +++++++++
 em-format/e-mail-part.h                    |    1 +
 3 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/em-format/e-mail-formatter-print-headers.c b/em-format/e-mail-formatter-print-headers.c
index 591c28e..6e4826d 100644
--- a/em-format/e-mail-formatter-print-headers.c
+++ b/em-format/e-mail-formatter-print-headers.c
@@ -137,7 +137,7 @@ emfpe_headers_format (EMailFormatterExtension *extension,
        for (link = head; link != NULL; link = g_list_next (link)) {
                EMailPart *mail_part = link->data;
 
-               if (g_queue_is_empty (&mail_part->validities))
+               if (!e_mail_part_has_validity (mail_part))
                        continue;
 
                if (!e_mail_part_id_has_prefix (mail_part, part_id_prefix))
diff --git a/em-format/e-mail-part.c b/em-format/e-mail-part.c
index b7e4d67..ba43e7e 100644
--- a/em-format/e-mail-part.c
+++ b/em-format/e-mail-part.c
@@ -362,3 +362,12 @@ e_mail_part_get_validity (EMailPart *part,
 
        return pair ? pair->validity : NULL;
 }
+
+gboolean
+e_mail_part_has_validity (EMailPart *part)
+{
+       g_return_val_if_fail (part != NULL, FALSE);
+
+       return !g_queue_is_empty (&part->validities);
+}
+
diff --git a/em-format/e-mail-part.h b/em-format/e-mail-part.h
index 19e62ac..bcb4270 100644
--- a/em-format/e-mail-part.h
+++ b/em-format/e-mail-part.h
@@ -118,6 +118,7 @@ void                e_mail_part_update_validity     (EMailPart *part,
 CamelCipherValidity *
                e_mail_part_get_validity        (EMailPart *part,
                                                 guint32 validity_type);
+gboolean       e_mail_part_has_validity        (EMailPart *part);
 
 G_END_DECLS