fixed # 179

don’t identify primitive (static) C-Slots as implicit formal parameters

blocks.js

@@ -5262,7 +5262,7 @@ CommandSlotMorph.prototype.evaluate = function () {
 };
 
 CommandSlotMorph.prototype.isEmptySlot = function () {
-    return this.nestedBlock() === null;
+    return !this.isStatic && (this.nestedBlock() === null);
 };
 
 // CommandSlotMorph context menu ops

history.txt

@@ -2015,3 +2015,4 @@ ______
 * Localization and Portuguese translation updates, thanks, Manuel!
 * Catalan translation update, thanks, Bernat!!
 * Threads: Text comparisons are now case-sensitive („fixes“ #175)
+* Threads: fixed # 179 - don’t identify primitive (static) C-Slots as implicit formal parameters