Fix brace node extraction from class initializer

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetClassInitializer.java

@@ -44,10 +44,9 @@ public class JetClassInitializer extends JetDeclarationImpl implements JetStatem
         return body;
     }
 
-    @NotNull
+    @Nullable
     public PsiElement getOpenBraceNode() {
-        ASTNode openBraceNode = getNode().findChildByType(JetTokens.LBRACE);
-        assert openBraceNode != null;
-        return openBraceNode.getPsi();
+        JetExpression body = getBody();
+        return (body instanceof JetBlockExpression) ? ((JetBlockExpression) body).getLBrace() : null;
     }
 }

idea/src/org/jetbrains/jet/plugin/codeInsight/upDownMover/JetDeclarationMover.java

@@ -35,7 +35,10 @@ public class JetDeclarationMover extends AbstractJetUpDownMover {
                 new JetVisitorVoid() {
                     @Override
                     public void visitAnonymousInitializer(JetClassInitializer initializer) {
-                        memberSuspects.add(initializer.getOpenBraceNode());
+                        PsiElement brace = initializer.getOpenBraceNode();
+                        if (brace != null) {
+                            memberSuspects.add(brace);
+                        }
                     }
 
                     @Override