[tracker/tracker-0.8] SPARQL: Warn instead of crash on namespace without prefix

[Martyn James Russell <mr src gnome org>]

commit 63f06dfdf7f7207c0c083424d67499f7a71cee22
Author: Jürg Billeter <j bitron ch>
Date:   Mon Jun 7 13:37:56 2010 +0200

    SPARQL: Warn instead of crash on namespace without prefix

 src/libtracker-data/tracker-sparql-query.vala |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index 07fe90f..e9991e7 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -382,6 +382,10 @@ public class Tracker.Sparql.Query : Object {
 		prefix_map.insert ("fn", FN_NS);
 
 		foreach (Namespace ns in Ontologies.get_namespaces ()) {
+			if (ns.prefix == null) {
+				critical ("Namespace does not specify a prefix: %s", ns.uri);
+				continue;
+			}
 			prefix_map.insert (ns.prefix, ns.uri);
 		}
 
@@ -415,6 +419,10 @@ public class Tracker.Sparql.Query : Object {
 		prefix_map.insert ("fn", FN_NS);
 
 		foreach (Namespace ns in Ontologies.get_namespaces ()) {
+			if (ns.prefix == null) {
+				critical ("Namespace does not specify a prefix: %s", ns.uri);
+				continue;
+			}
 			prefix_map.insert (ns.prefix, ns.uri);
 		}