f321x b6a4ebecda wallet: fix AttributeError when getting help text ...

Fixes AttributeError when trying to get `num_sats_can_receive()` in
wallets without lnworker. Fixes https://github.com/spesmilo/electrum/issues/8100#issuecomment-3294556043.

```
Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/electrum/gui/qt/request_list.py", line 103, in selection_changed
    self.receive_tab.update_current_request()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/electrum/gui/qt/receive_tab.py", line 237, in update_current_request
    help_texts = self.wallet.get_help_texts_for_receive_request(req)
  File "/usr/lib/python3.13/site-packages/electrum/wallet.py", line 3446, in get_help_texts_for_receive_request
    can_receive = self.lnworker.num_sats_can_receive()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'num_sats_can_receive'
```

2025-09-16 09:38:01 +02:00

185 KiB

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