[gthumb] initialize the type to null and set it to null if a void string is returned

[Paolo Bacchilega <paobac src gnome org>]

commit 3dda6555fa182e4eba71c6b0a47a4a51f3b01c15
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Jul 20 12:40:17 2011 +0200

    initialize the type to null and set it to null if a void string is returned

 extensions/exiv2_tools/exiv2-utils.cpp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/extensions/exiv2_tools/exiv2-utils.cpp b/extensions/exiv2_tools/exiv2-utils.cpp
index 7d82f2d..a0f5ecb 100644
--- a/extensions/exiv2_tools/exiv2-utils.cpp
+++ b/extensions/exiv2_tools/exiv2-utils.cpp
@@ -835,12 +835,12 @@ const char *
 gth_main_get_metadata_type (gpointer    metadata,
 			    const char *attribute)
 {
-	const char      *value_type;
+	const char      *value_type = NULL;
 	GthMetadataInfo *metadatum_info;
 
 	if (GTH_IS_METADATA (metadata)) {
 		value_type = gth_metadata_get_value_type (GTH_METADATA (metadata));
-		if (g_strcmp0 (value_type, "Undefined") == 0)
+		if ((g_strcmp0 (value_type, "Undefined") == 0) || (g_strcmp0 (value_type, "") == 0))
 			value_type = NULL;
 
 		if (value_type != NULL)