Throw an error for “obsolete” blocks

instead of (forever) doing nothing (and thus often freezing and
crashing). Thanks, Paul, for helping identify this!

history.txt

@@ -2858,3 +2858,7 @@ end - bulk of 151215
 ------
 * Paint: avoid pixel collision detection in PaintCanvas (optimization)
 * BYOB: fixed a zebra coloring glitch in the block editor
+
+160119
+------
+* Threads, Store: Throw an error for “obsolete” blocks instead of (forever) doing nothing (and thus often freezing and crashing). Thanks, Paul, for helping identify this!

store.js

@@ -7,7 +7,7 @@
     written by Jens Mönig
     jens@moenig.org
 
-    Copyright (C) 2015 by Jens Mönig
+    Copyright (C) 2016 by Jens Mönig
 
     This file is part of Snap!.
 
@@ -61,7 +61,7 @@ SyntaxElementMorph, Variable*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.store = '2015-December-15';
+modules.store = '2016-January-19';
 
 
 // XML_Serializer ///////////////////////////////////////////////////////
@@ -1073,7 +1073,7 @@ SnapSerializer.prototype.obsoleteBlock = function (isReporter) {
     // private
     var block = isReporter ? new ReporterBlockMorph()
             : new CommandBlockMorph();
-    block.selector = 'nop';
+    block.selector = 'errorObsolete';
     block.color = new Color(200, 0, 20);
     block.setSpec('Obsolete!');
     block.isDraggable = true;

threads.js

@@ -83,7 +83,7 @@ ArgLabelMorph, localize, XML_Element, hex_sha512*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.threads = '2016-January-08';
+modules.threads = '2016-January-19';
 
 var ThreadManager;
 var Process;
@@ -869,6 +869,10 @@ Process.prototype.handleError = function (error, element) {
     );
 };
 
+Process.prototype.errorObsolete = function () {
+    throw new Error('a custom block definition is missing');
+};
+
 // Process Lambda primitives
 
 Process.prototype.reify = function (topBlock, parameterNames, isCustomBlock) {