tweaked yesterday's fix...

HISTORY.md

@@ -39,7 +39,10 @@
     * Greek, thanks, Alexandros!
     * German
 
-### 2019-02-07
+### 2019-02-15
+* BYOB: tweaked yesterday's fix...
+
+### 2019-02-14
 * BYOB: keep empty numerical input slots in custom blocks empty when relabelling
 
 ### 2019-02-07

snap.html

@@ -12,7 +12,7 @@
         <script type="text/javascript" src="src/gui.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/paint.js?version=2018-10-02"></script>
         <script type="text/javascript" src="src/lists.js?version=2019-02-07"></script>
-        <script type="text/javascript" src="src/byob.js?version=2019-02-14"></script>
+        <script type="text/javascript" src="src/byob.js?version=2019-02-15"></script>
         <script type="text/javascript" src="src/tables.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/symbols.js?version=2019-01-14"></script>
         <script type="text/javascript" src="src/sketch.js?version=2018-10-02"></script>

src/byob.js

@@ -108,7 +108,7 @@ BooleanSlotMorph, XML_Serializer, SnapTranslator*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2019-February-14';
+modules.byob = '2019-February-15';
 
 // Declarations
 
@@ -678,7 +678,9 @@ CustomCommandBlockMorph.prototype.restoreInputs = function (oldInputs) {
             myself.silentReplaceInput(inp, old.fullCopy());
         } else if (old instanceof InputSlotMorph
                 && inp instanceof InputSlotMorph) {
-            if (!old.isEmptySlot()) {
+            if (old.isEmptySlot()) {
+                inp.setContents('');
+            } else {
                 inp.setContents(old.evaluate());
             }
         } else if (old instanceof BooleanSlotMorph