if a network object is there but fee estimates are not available,

raise NoDynamicFeeEstimates in FeePolicy rather than in wallet.

Also, show an error message in Qt

electrum/fee_policy.py

@@ -243,13 +243,12 @@ class FeePolicy(Logger):
     ) -> int:
         if self.method == FeeMethod.FIXED:
             return self.value
-        if network is None and self.use_dynamic_estimates:
+        fee_per_kb = self.fee_per_kb(network)
+        if fee_per_kb is None and self.use_dynamic_estimates:
             if allow_fallback_to_static_rates:
                 fee_per_kb = FEERATE_FALLBACK_STATIC_FEE
             else:
                 raise NoDynamicFeeEstimates()
-        else:
-            fee_per_kb = self.fee_per_kb(network)
 
         return self.estimate_fee_for_feerate(fee_per_kb, size)
 

electrum/gui/qt/confirm_tx_dialog.py

@@ -569,6 +569,8 @@ class TxEditor(WindowModalDialog):
                 self.error = long_warning
             else:
                 messages.append(long_warning)
+        if self.no_dynfee_estimates:
+            self.error = _('Fee estimates not available. Please set a fixed fee or feerate.')
         if self.tx.get_dummy_output(DummyAddress.SWAP):
             messages.append(_('This transaction will send funds to a submarine swap.'))
         # warn if spending unconf

electrum/wallet.py

@@ -1854,9 +1854,6 @@ class Abstract_Wallet(ABC, Logger, EventListener):
                 i_max_sum += weight
                 i_max.append((weight, i))
 
-        if fee_policy.method is not FeeMethod.FIXED and fee_policy.fee_per_kb(self.network) is None:
-            raise NoDynamicFeeEstimates()
-
         for txin in coins:
             self.add_input_info(txin)
             nSequence = 0xffffffff - (2 if rbf else 1)