[evolution-data-server/gnome-3-8] Switch NULL to empty string in e_util_utf8_{data_}make_valid()

[Milan Crha <mcrha src gnome org>]

commit c57c399e0b7f102f5239c95b97c785cf831a8ec8
Author: Milan Crha <mcrha redhat com>
Date:   Tue Apr 16 16:51:50 2013 +0200

    Switch NULL to empty string in e_util_utf8_{data_}make_valid()
    
    It's used on various places which expect a valid string, but which
    doesn't check for NULL values of the string, which can cause a crash,
    like xtian found with e_data_cal_respond_get_object(), which can have
    passed in a NULL object. This change is also to avoid NULL-checking
    on too many places.

 libedataserver/e-data-server-util.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/libedataserver/e-data-server-util.c b/libedataserver/e-data-server-util.c
index 03f07d9..864da07 100644
--- a/libedataserver/e-data-server-util.c
+++ b/libedataserver/e-data-server-util.c
@@ -461,6 +461,7 @@ e_util_utf8_remove_accents (const gchar *str)
  *
  * Returns a newly-allocated copy of @str, with invalid characters
  * replaced by Unicode replacement characters (U+FFFD).
+ * For %NULL @str returns newly allocated empty string ("").
  *
  * Returns: a newly-allocated string
  *
@@ -469,6 +470,9 @@ e_util_utf8_remove_accents (const gchar *str)
 gchar *
 e_util_utf8_make_valid (const gchar *str)
 {
+       if (!str)
+               return g_strdup ("");
+
        return e_util_utf8_data_make_valid (str, strlen (str));
 }
 
@@ -479,6 +483,7 @@ e_util_utf8_make_valid (const gchar *str)
  *
  * Returns a newly-allocated NULL-terminated string with invalid characters
  * replaced by Unicode replacement characters (U+FFFD).
+ * For %NULL @data returns newly allocated empty string ("").
  *
  * Returns: a newly-allocated string
  *
@@ -493,7 +498,8 @@ e_util_utf8_data_make_valid (const gchar *data,
        const gchar *remainder, *invalid;
        gint remaining_bytes, valid_bytes;
 
-       g_return_val_if_fail (data != NULL, NULL);
+       if (!data)
+               return g_strdup ("");
 
        string = NULL;
        remainder = (gchar *) data,