Improve exception handling

bot.py

@@ -14,6 +14,7 @@ SERVER = os.environ['SERVER']
 import monkey_patch # must be before any possible pyCraft imports
 
 from custom.managers import DataManager, ChunksManager, ChatManager
+from custom.managers.chunks import ChunkNotLoadedException
 
 from minecraft import authentication
 from minecraft.exceptions import YggdrasilError
@@ -53,7 +54,7 @@ def tick(global_state):
 
     try:
         g.chunks.get_block_at(*utils.pint(p))
-    except chunks.ChunkNotLoadedException:
+    except ChunkNotLoadedException:
         return
 
     #l.jobstate.run()
@@ -161,7 +162,7 @@ def bot(global_state):
     g = global_state
     g.local_state = Bunch()
 
-    if 'mcdata' not in g:
+    if not g.mcdata:
         g.mcdata = DataManager('./mcdata')
 
     if not g.connection:
@@ -175,7 +176,6 @@ def bot(global_state):
         g.connection = Connection(SERVER, 25565, auth_token=auth_token)
 
         g.chunks = ChunksManager(g.mcdata)
-        g.chunks.register(g.connection)
 
         g.connection.connect()
 
@@ -184,6 +184,8 @@ def bot(global_state):
             handler(packet, g)
         return wrapper
 
+    g.chunks.register(g.connection)
+
     h1 = packet_wrapper(packet_handlers.handle_join_game)
     g.connection.register_packet_listener(h1, clientbound.play.JoinGamePacket)