From 531b6caf5d5cfdc0b56d3833285332d4538a3bb3 Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Fri, 18 Nov 2016 13:32:31 -0800
Subject: [PATCH] Stop some blocks from throwing errors in headless workspaces.

---
 blocks/loops.js      | 2 +-
 blocks/procedures.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/blocks/loops.js b/blocks/loops.js
index 3d72d5b56..f89a528d7 100644
--- a/blocks/loops.js
+++ b/blocks/loops.js
@@ -257,7 +257,7 @@ Blockly.Blocks['controls_flow_statements'] = {
    * @this Blockly.Block
    */
   onchange: function(e) {
-    if (this.workspace.isDragging()) {
+    if (!this.workspace.isDragging || this.workspace.isDragging()) {
       return;  // Don't change state at the start of a drag.
     }
     var legal = false;
diff --git a/blocks/procedures.js b/blocks/procedures.js
index 25661c217..79f9bf694 100644
--- a/blocks/procedures.js
+++ b/blocks/procedures.js
@@ -843,7 +843,7 @@ Blockly.Blocks['procedures_ifreturn'] = {
    * @this Blockly.Block
    */
   onchange: function(e) {
-    if (this.workspace.isDragging()) {
+    if (!this.workspace.isDragging || this.workspace.isDragging()) {
       return;  // Don't change state at the start of a drag.
     }
     var legal = false;