Fix judge buttons not appearing & crash if MS goes down during play.

The former was caused by the position dropdown simply not having code to
make the judge buttons appear. Alongside that, the issue(?) where `/pos
judddd` (or variations) would not put the user in the judge position,
but gave them the buttons anyway.

The latter was caused by a simple mistake. We deleted the Lobby (and the
Courtroom) frequently, however, we never did set its (their) pointer(s)
back to null -- so they pointer to trash data, and the `if (w_lobby !=
nullptr)` part never failed.

This is also now fixed, and deletion of the Lobby or the Courtroom also
brings about the nulling of their pointers.

aoapplication.cpp

@@ -57,6 +57,7 @@ void AOApplication::destruct_lobby()
   }
 
   delete w_lobby;
+  w_lobby = nullptr;
   lobby_constructed = false;
 }
 
@@ -86,6 +87,7 @@ void AOApplication::destruct_courtroom()
   }
 
   delete w_courtroom;
+  w_courtroom = nullptr;
   courtroom_constructed = false;
 }
 
@@ -157,7 +159,7 @@ void AOApplication::ms_connect_finished(bool connected, bool will_retry)
   {
     if (will_retry)
     {
-      if (w_lobby != nullptr)
+      if (lobby_constructed)
         w_lobby->append_error("Error connecting to master server. Will try again in "
                             + QString::number(net_manager->ms_reconnect_delay_ms / 1000.f) + " seconds.");
     }

courtroom.cpp

@@ -2585,6 +2585,32 @@ void Courtroom::set_hp_bar(int p_bar, int p_state)
   }
 }
 
+void Courtroom::toggle_judge_buttons(bool is_on)
+{
+  if (is_on)
+  {
+    ui_witness_testimony->show();
+    ui_cross_examination->show();
+    ui_guilty->show();
+    ui_not_guilty->show();
+    ui_defense_minus->show();
+    ui_defense_plus->show();
+    ui_prosecution_minus->show();
+    ui_prosecution_plus->show();
+  }
+  else
+  {
+    ui_witness_testimony->hide();
+    ui_cross_examination->hide();
+    ui_guilty->hide();
+    ui_not_guilty->hide();
+    ui_defense_minus->hide();
+    ui_defense_plus->hide();
+    ui_prosecution_minus->hide();
+    ui_prosecution_plus->hide();
+  }
+}
+
 void Courtroom::mod_called(QString p_ip)
 {
   ui_server_chatlog->append(p_ip);
@@ -2621,27 +2647,13 @@ void Courtroom::on_ooc_return_pressed()
 
   if (ooc_message.startsWith("/pos"))
   {
-    if (ooc_message.startsWith("/pos jud"))
+    if (ooc_message == "/pos jud")
     {
-      ui_witness_testimony->show();
-      ui_cross_examination->show();
-      ui_guilty->show();
-      ui_not_guilty->show();
-      ui_defense_minus->show();
-      ui_defense_plus->show();
-      ui_prosecution_minus->show();
-      ui_prosecution_plus->show();
+      toggle_judge_buttons(true);
     }
     else
     {
-      ui_witness_testimony->hide();
-      ui_cross_examination->hide();
-      ui_guilty->hide();
-      ui_not_guilty->hide();
-      ui_defense_minus->hide();
-      ui_defense_plus->hide();
-      ui_prosecution_minus->hide();
-      ui_prosecution_plus->hide();
+      toggle_judge_buttons(false);
     }
   }
   else if (ooc_message.startsWith("/login"))
@@ -2891,6 +2903,8 @@ void Courtroom::on_pos_dropdown_changed(int p_index)
   if (p_index < 0 || p_index > 5)
     return;
 
+  toggle_judge_buttons(false);
+
   QString f_pos;
 
   switch (p_index)
@@ -2906,6 +2920,7 @@ void Courtroom::on_pos_dropdown_changed(int p_index)
     break;
   case 3:
     f_pos = "jud";
+    toggle_judge_buttons(true);
     break;
   case 4:
     f_pos = "hld";

courtroom.h

@@ -204,6 +204,9 @@ public:
   //state is an number between 0 and 10 inclusive
   void set_hp_bar(int p_bar, int p_state);
 
+  //Toggles the judge buttons, whether they should appear or not.
+  void toggle_judge_buttons(bool is_on);
+
   void announce_case(QString title, bool def, bool pro, bool jud, bool jur, bool steno);
 
   void check_connection_received();