qt: don't show empty BalanceDialog

electrum/gui/qt/balance_dialog.py

@@ -39,6 +39,10 @@ from electrum.i18n import _
 
 from .util import Buttons, CloseButton, WindowModalDialog, ColorScheme
 
+if TYPE_CHECKING:
+    from .main_window import ElectrumWindow
+    from electrum.wallet import Abstract_Wallet
+
 
 # Todo:
 #  show lightning funds that are not usable
@@ -140,7 +144,7 @@ class LegendWidget(QWidget):
 
 class BalanceDialog(WindowModalDialog):
 
-    def __init__(self, parent, wallet):
+    def __init__(self, parent: 'ElectrumWindow', *, wallet: 'Abstract_Wallet'):
 
         WindowModalDialog.__init__(self, parent, _("Wallet Balance"))
         self.wallet = wallet

electrum/gui/qt/main_window.py

@@ -2432,8 +2432,11 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         console.updateNamespace(methods)
 
     def show_balance_dialog(self):
+        balance = sum(self.wallet.get_balances_for_piechart())
+        if balance == 0:
+            return
         from .balance_dialog import BalanceDialog
-        d = BalanceDialog(self, self.wallet)
+        d = BalanceDialog(self, wallet=self.wallet)
         d.run()
 
     def create_status_bar(self):