don't show entries that are only declines

dudlebot.py

@@ -127,12 +127,15 @@ class DudleBot:
         formatted_plan += f"{'|'.join([day.strftime('%A')[:2] for day in days])}"
         formatted_plan += "\n"
 
-        if len(plan.entries) == 0:
-            entries = {-1: PlanEntry(name="???", responses=[])}
-        else:
-            entries = plan.entries
+        entries_with_content = [entry for entry in plan.entries.values() if
+                                any(response != PlanResponse.NO for response in entry.responses)]
 
-        for entry in entries.values():
+        if len(entries_with_content) == 0:
+            entries = [PlanEntry(name="???", responses=[])]
+        else:
+            entries = plan.entries.values()
+
+        for entry in entries:
             responses = [entry.responses[i] if i < len(entry.responses) else PlanResponse.UNKNOWN
                          for i in range(plan.duration.days)]