commit 0bc4ba936db39ccf0466987d964a016363bceeee
Author: Richard Hughes <richard@hughsie.com>
Date:   Wed Sep 10 15:17:01 2008 +0100

    bugfix: don't convert null sections of a package_id to '(NULL)' instead use an empty string.

diff --git a/libpackagekit/pk-package-id.c b/libpackagekit/pk-package-id.c
index f328225..9d911fb 100644
--- a/libpackagekit/pk-package-id.c
+++ b/libpackagekit/pk-package-id.c
@@ -218,9 +214,12 @@ pk_package_id_copy (const PkPackageId *id)
 gchar *
 pk_package_id_to_string (const PkPackageId *id)
 {
-	return g_strdup_printf ("%s;%s;%s;%s",
-				id->name, id->version,
-				id->arch, id->data);
+	g_return_val_if_fail (id != NULL, NULL);
+	g_return_val_if_fail (id->name != NULL, NULL);
+	return g_strdup_printf ("%s;%s;%s;%s", id->name,
+				id->version != NULL ? id->version : "",
+				id->arch != NULL ? id->arch : "",
+				id->data != NULL ? id->data : "");
 }
 
 /**
@@ -237,11 +236,10 @@ pk_package_id_build (const gchar *name, const gchar *version,
 		     const gchar *arch, const gchar *data)
 {
 	g_return_val_if_fail (name != NULL, NULL);
-	g_return_val_if_fail (version != NULL, NULL);
-	g_return_val_if_fail (arch != NULL, NULL);
-	g_return_val_if_fail (data != NULL, NULL);
-
-	return g_strdup_printf ("%s;%s;%s;%s", name, version, arch, data);
+	return g_strdup_printf ("%s;%s;%s;%s", name,
+				version != NULL ? version : "",
+				arch != NULL ? arch : "",
+				data != NULL ? data : "");
 }
 
 /**