Suppress warning

src/lib/Transaction.vala

@@ -60,6 +60,7 @@ namespace Usm {
             report_progress(TransactionTask.STRATEGISING, 0.0f);
             install_lots = new Vector<Vector<CachedPackage>>();
             install_lots.add(to_install.to_vector());
+            remove_order = new Vector<CachedPackage>();
 
 
             report_progress(TransactionTask.STRATEGISING, 1.0f);