fix npe in terminal for exchange rate updates without a btc rate

src/main/java/com/sparrowwallet/sparrow/terminal/wallet/TransactionsDialog.java

@@ -95,8 +95,8 @@ public class TransactionsDialog extends WalletDialog {
             mempoolBalance.setText(formatBitcoinValue(walletTransactionsEntry.getMempoolBalance(), true));
 
             if(AppServices.getFiatCurrencyExchangeRate() != null) {
-                fiatBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getBalance(), AppServices.getFiatCurrencyExchangeRate().getBtcRate())));
+                fiatBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getBalance(), AppServices.getFiatCurrencyExchangeRate())));
-                fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getMempoolBalance(), AppServices.getFiatCurrencyExchangeRate().getBtcRate())));
+                fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getMempoolBalance(), AppServices.getFiatCurrencyExchangeRate())));
             } else {
                 fiatBalance.setText("");
                 fiatMempoolBalance.setText("");
@@ -149,8 +149,8 @@ public class TransactionsDialog extends WalletDialog {
     public void exchangeRatesUpdated(ExchangeRatesUpdatedEvent event) {
         SparrowTerminal.get().getGuiThread().invokeLater(() -> {
             WalletTransactionsEntry walletTransactionsEntry = getWalletForm().getWalletTransactionsEntry();
-            fiatBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getBalance(), event.getBtcRate())));
+            fiatBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getBalance(), event.getCurrencyRate())));
-            fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getMempoolBalance(), event.getBtcRate())));
+            fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletTransactionsEntry.getMempoolBalance(), event.getCurrencyRate())));
         });
     }
 }

src/main/java/com/sparrowwallet/sparrow/terminal/wallet/UtxosDialog.java

@@ -191,8 +191,8 @@ public class UtxosDialog extends WalletDialog {
             mempoolBalance.setText(formatBitcoinValue(walletUtxosEntry.getMempoolBalance(), true));
 
             if(AppServices.getFiatCurrencyExchangeRate() != null) {
-                fiatBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getBalance(), AppServices.getFiatCurrencyExchangeRate().getBtcRate())));
+                fiatBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getBalance(), AppServices.getFiatCurrencyExchangeRate())));
-                fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getMempoolBalance(), AppServices.getFiatCurrencyExchangeRate().getBtcRate())));
+                fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getMempoolBalance(), AppServices.getFiatCurrencyExchangeRate())));
             } else {
                 fiatBalance.setText("");
                 fiatMempoolBalance.setText("");
@@ -405,8 +405,8 @@ public class UtxosDialog extends WalletDialog {
     public void exchangeRatesUpdated(ExchangeRatesUpdatedEvent event) {
         SparrowTerminal.get().getGuiThread().invokeLater(() -> {
             WalletUtxosEntry walletUtxosEntry = getWalletForm().getWalletUtxosEntry();
-            fiatBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getBalance(), event.getBtcRate())));
+            fiatBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getBalance(), event.getCurrencyRate())));
-            fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getMempoolBalance(), event.getBtcRate())));
+            fiatMempoolBalance.setText(formatFiatValue(getFiatValue(walletUtxosEntry.getMempoolBalance(), event.getCurrencyRate())));
         });
     }
 }

src/main/java/com/sparrowwallet/sparrow/terminal/wallet/WalletDialog.java

@@ -81,8 +81,12 @@ public class WalletDialog extends DialogWindow {
         }
     }
 
-    protected double getFiatValue(long satsValue, Double btcRate) {
+    protected double getFiatValue(long satsValue, CurrencyRate currencyRate) {
-        return satsValue * btcRate / Transaction.SATOSHIS_PER_BITCOIN;
+        if(currencyRate != null && currencyRate.isAvailable()) {
+            return satsValue * currencyRate.getBtcRate() / Transaction.SATOSHIS_PER_BITCOIN;
+        }
+
+        return 0d;
     }
 
     protected static String centerPad(String text, int length) {