[gnome-documents] miner: return an empty string when no graph is passed into

[Cosimo Cecchi <cosimoc src gnome org>]

commit 7d2eaeacdfd5084b80cec53eb887e9ff7c892690
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu Oct 13 14:12:55 2011 -0400

    miner: return an empty string when no graph is passed into
    
    Instead of NULL, which doesn't play nice when the string is inserted
    into a printf(), as it's the case for the graph string here.

 src/miner/gd-gdata-miner.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/miner/gd-gdata-miner.c b/src/miner/gd-gdata-miner.c
index 208bbfc..ba2743f 100644
--- a/src/miner/gd-gdata-miner.c
+++ b/src/miner/gd-gdata-miner.c
@@ -44,7 +44,7 @@ struct _GdGDataMinerPrivate {
 static gchar *
 _tracker_utils_format_into_graph (const gchar *graph)
 {
-  return (graph != NULL) ? g_strdup_printf ("INTO <%s> ", graph) : NULL;
+  return (graph != NULL) ? g_strdup_printf ("INTO <%s> ", graph) : g_strdup ("");
 }
 
 static gboolean