fixed deleting a single command inside a stack

which somehow got broken when allowing commands inside reporter rings

HISTORY.md

@@ -41,6 +41,9 @@
     * Greek, thanks, Alexandros!
     * German
 
+### 2019-02-21
+* Blocks: fixed deleting a single command inside a stack
+
 ### 2019-02-20
 * Tweaked German translation
 * Vector editor color name changes, thanks, Brian!

snap.html

@@ -6,7 +6,7 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/widgets.js?version=2018-10-02"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-02-15"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-02-21"></script>
         <script type="text/javascript" src="src/threads.js?version=2019-02-19"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-02-18"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-02-20"></script>

src/blocks.js

@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-February-15';
+modules.blocks = '2019-February-21';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -4805,7 +4805,9 @@ CommandBlockMorph.prototype.userDestroyJustThis = function () {
         this.destroy(true); // just this block
     }
     if (nb) {
-        if (above instanceof CommandSlotMorph, RingReporterSlotMorph) {
+        if (above instanceof CommandSlotMorph ||
+            above instanceof RingReporterSlotMorph
+        ) {
             above.nestedBlock(nb);
         } else if (above instanceof CommandBlockMorph) {
             above.nextBlock(nb);