Don't allow spectating deadchat if one is already in it

messages/en.json

@@ -749,6 +749,7 @@
     "fspectate_help": "Usage: fspectate <wolfchat|deadchat> [on|off]",
     "fspectate_restricted": "You may not spectate while playing.",
     "fspectate_deadchat_disabled": "Deadchat is disabled and may not be spectated.",
+    "fspectate_in_deadchat": "You are currently in deadchat.",
     "fspectate_on": "You are now spectating {0}.",
     "fspectate_off": "You are no longer spectating {0}."
 }

src/wolfgame.py

@@ -8877,6 +8877,9 @@ def fspectate(cli, nick, chan, rest):
             var.SPECTATING_WOLFCHAT.add(nick)
             players = (p for p in var.list_players() if in_wolflist(p, p))
         elif var.ENABLE_DEADCHAT:
+            if nick in var.DEADCHAT_PLAYERS:
+                pm(cli, nick, messages["fspectate_in_deadchat"])
+                return
             var.SPECTATING_DEADCHAT.add(nick)
             players = var.DEADCHAT_PLAYERS
         else: