omit the threshold if doom is reset

src/core/DoomCounter.ttslua

@@ -58,7 +58,11 @@ end
 function updateVal(number)
   val = number or 0
   self.editButton({ index = 0, label = tostring(val) })
-  broadcastDoom(val)
+  if number then
+    broadcastDoom(val)
+  else
+    broadcastToAll("0 doom on the agenda", "White")
+  end
 end
 
 -- called by updateVal and addVal to broadcast total doom in play, including doom threshold
@@ -77,7 +81,8 @@ end
 -- called by "Reset" button to remove doom
 function startReset()
   if options.Agenda then
-    updateVal(0)
+    -- omitting the number will broadcast a special message just for this case
+    updateVal()
   end
   local doomInPlayCounter = guidReferenceApi.getObjectByOwnerAndType("Mythos", "DoomInPlayCounter")
   if doomInPlayCounter then