lnworker: follow-up 89a14996ce

this fixes running with --offline:

E | gui.qt.exception_window.Exception_Hook | exception caught by crash reporter
Traceback (most recent call last):
  File "...\electrum\electrum\gui\qt\channels_list.py", line 241, in do_update_rows
    items = [QtGui.QStandardItem(x) for x in self.format_fields(chan)]
  File "...\electrum\electrum\gui\qt\channels_list.py", line 82, in format_fields
    node_alias = self.lnworker.get_node_alias(chan.node_id)
  File "...\electrum\electrum\lnworker.py", line 188, in get_node_alias
    if self.channel_db:
AttributeError: 'LNWallet' object has no attribute 'channel_db'

electrum/lnworker.py

@@ -78,6 +78,8 @@ from .submarine_swaps import SwapManager
 if TYPE_CHECKING:
     from .network import Network
     from .wallet import Abstract_Wallet
+    from .channel_db import ChannelDB
+    from .simple_config import SimpleConfig
 
 
 SAVED_PR_STATUS = [PR_PAID, PR_UNPAID, PR_INFLIGHT] # status that are persisted
@@ -173,6 +175,10 @@ class LNWorker(Logger, NetworkRetryManager[LNPeerAddr]):
         self.features |= LnFeatures.VAR_ONION_OPT
         self.features |= LnFeatures.PAYMENT_SECRET_OPT
 
+        self.network = None  # type: Optional[Network]
+        self.config = None  # type: Optional[SimpleConfig]
+        self.channel_db = None  # type: Optional[ChannelDB]
+
         util.register_callback(self.on_proxy_changed, ['proxy_set'])
 
     @property
@@ -521,8 +527,8 @@ class LNWallet(LNWorker):
         Logger.__init__(self)
         self.wallet = wallet
         self.db = wallet.db
-        self.config = wallet.config
         LNWorker.__init__(self, xprv)
+        self.config = wallet.config
         self.lnwatcher = None
         self.lnrater: LNRater = None
         self.features |= LnFeatures.OPTION_DATA_LOSS_PROTECT_REQ