To reproduce: enter "." to amount_e in Send tab; then click "Save".
Traceback (most recent call last):
File "/home/user/wspace/electrum/electrum/gui/qt/main_window.py", line 1638, in do_save_invoice
self.pending_invoice = self.read_invoice()
File "/home/user/wspace/electrum/electrum/gui/qt/main_window.py", line 1625, in read_invoice
outputs = self.read_outputs()
File "/home/user/wspace/electrum/electrum/gui/qt/main_window.py", line 1501, in read_outputs
outputs = self.payto_e.get_outputs(self.max_button.isChecked())
File "/home/user/wspace/electrum/electrum/gui/qt/paytoedit.py", line 235, in get_outputs
self.outputs = [PartialTxOutput(scriptpubkey=self.payto_scriptpubkey, value=amount)]
File "/home/user/wspace/electrum/electrum/transaction.py", line 1533, in __init__
TxOutput.__init__(self, *args, **kwargs)
File "/home/user/wspace/electrum/electrum/transaction.py", line 113, in __init__
raise ValueError(f"bad txout value: {value!r}")
ValueError: bad txout value: None
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