CW-289-Fix bitcoin pending send receive transactions not showing until confirmed (#878)

* Fix error in rendering pending transactions in different device

* Show pending status

* Fix broken subscription stream

cw_bitcoin/lib/electrum.dart

@@ -410,7 +410,7 @@ class ElectrumClient {
     switch (method) {
       case 'blockchain.scripthash.subscribe':
         final params = request['params'] as List<dynamic>;
-        final scripthash = params.first as String;
+        final scripthash = params.first as String?;
         final id = 'blockchain.scripthash.subscribe:$scripthash';
 
         _tasks[id]?.subject?.add(params.last);
@@ -430,15 +430,17 @@ class ElectrumClient {
 
   void _handleResponse(Map<String, dynamic> response) {
     final method = response['method'];
-    final id = response['id'] as String;
+    final id = response['id'] as String?;
     final result = response['result'];
 
     if (method is String) {
       _methodHandler(method: method, request: response);
       return;
     }
-
-    _finish(id, result);
+    
+    if (id != null){
+      _finish(id, result);
+    }
   }
 }
 

cw_bitcoin/lib/electrum_transaction_info.dart

@@ -136,7 +136,7 @@ class ElectrumTransactionInfo extends TransactionInfo {
     return ElectrumTransactionInfo(type,
         id: bundle.originalTransaction.getId(),
         height: height,
-        isPending: false,
+        isPending: bundle.confirmations == 0,
         fee: fee,
         direction: direction,
         amount: amount,

cw_bitcoin/lib/electrum_wallet.dart

@@ -537,8 +537,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     final transactionHex = verboseTransaction['hex'] as String;
     final original = bitcoin.Transaction.fromHex(transactionHex);
     final ins = <bitcoin.Transaction>[];
-    final time = verboseTransaction['time'] as int;
-    final confirmations = verboseTransaction['confirmations'] as int ?? 0;
+    final time = verboseTransaction['time'] as int?;
+    final confirmations = verboseTransaction['confirmations'] as int? ?? 0;
 
     for (final vin in original.ins) {
       final id = HEX.encode(vin.hash!.reversed.toList());