[vala] Fix crash when using invalid conditional expressions

[Jürg Billeter <juergbi src gnome org>]

commit fc3150d0d356286917d57d7f057240c5a392d3bb
Author: Jürg Billeter <j bitron ch>
Date:   Mon Sep 14 18:14:39 2009 +0200

    Fix crash when using invalid conditional expressions
    
    Fixes bug 594400.

 vala/valaconditionalexpression.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/vala/valaconditionalexpression.vala b/vala/valaconditionalexpression.vala
index f521bc8..6c7e8d6 100644
--- a/vala/valaconditionalexpression.vala
+++ b/vala/valaconditionalexpression.vala
@@ -137,7 +137,8 @@ public class Vala.ConditionalExpression : Expression {
 		insert_statement (analyzer.insert_block, decl);
 		insert_statement (analyzer.insert_block, if_stmt);
 
-		if (!if_stmt.check (analyzer)) {
+		if (!if_stmt.check (analyzer) || true_expression.error || false_expression.error) {
+			error = true;
 			return false;
 		}