[tracker/sparql-delete] SPARQL: Fix crash on deletes when using blank nodes

[Jürg Billeter <juergbi src gnome org>]

commit 2c5bf0a54e7924b41ff749fe6c57a3d1dfe7ba19
Author: Jürg Billeter <j bitron ch>
Date:   Tue Mar 9 19:11:48 2010 +0100

    SPARQL: Fix crash on deletes when using blank nodes

 src/libtracker-data/tracker-sparql-query.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index d6111c7..b9783bc 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -537,7 +537,7 @@ public class Tracker.SparqlQuery : Object {
 			case SparqlTokenType.INSERT:
 			case SparqlTokenType.DELETE:
 				PtrArray* ptr = execute_insert_or_delete (blank);
-				if (blank) {
+				if (ptr != null) {
 					blank_nodes.add (ptr);
 				}
 				break;