Flutter upgrade

lib/view_model/node_list/node_create_or_edit_view_model.dart

@@ -14,7 +14,11 @@ abstract class NodeCreateOrEditViewModelBase with Store {
   NodeCreateOrEditViewModelBase(this._nodeSource, this._wallet)
       : state = InitialExecutionState(),
         connectionState = InitialExecutionState(),
-        useSSL = false;
+        useSSL = false,
+        address = '',
+        port = '',
+        login = '',
+        password = '';
 
   @observable
   ExecutionState state;
@@ -39,7 +43,7 @@ abstract class NodeCreateOrEditViewModelBase with Store {
 
   @computed
   bool get isReady =>
-      (address?.isNotEmpty ?? false) && (port?.isNotEmpty ?? false);
+      address.isNotEmpty && port.isNotEmpty;
 
   bool get hasAuthCredentials => _wallet.type == WalletType.monero ||
     _wallet.type == WalletType.haven;
@@ -47,7 +51,7 @@ abstract class NodeCreateOrEditViewModelBase with Store {
   String get uri {
     var uri = address;
 
-    if (port != null && port.isNotEmpty) {
+    if (port.isNotEmpty) {
       uri += ':' + port;
     }
 

lib/view_model/node_list/node_list_view_model.dart

@@ -20,7 +20,15 @@ abstract class NodeListViewModelBase with Store {
   }
 
   @computed
-  Node get currentNode => settingsStore.nodes[wallet.type];
+  Node get currentNode {
+    final node = settingsStore.nodes[wallet.type];
+
+    if (node == null) {
+      throw Exception('No node for wallet type: ${wallet.type}');
+    }
+
+    return node;
+  }
 
   final ObservableList<Node> nodes;
   final SettingsStore settingsStore;
@@ -34,16 +42,16 @@ abstract class NodeListViewModelBase with Store {
 
     switch (wallet.type) {
       case WalletType.bitcoin:
-        node = getBitcoinDefaultElectrumServer(nodes: _nodeSource);
+        node = getBitcoinDefaultElectrumServer(nodes: _nodeSource)!;
         break;
       case WalletType.monero:
         node = getMoneroDefaultNode(nodes: _nodeSource);
         break;
       case WalletType.litecoin:
-        node = getLitecoinDefaultElectrumServer(nodes: _nodeSource);
+        node = getLitecoinDefaultElectrumServer(nodes: _nodeSource)!;
         break;
       default:
-        break;
+        throw Exception('Unexpected wallet type: ${wallet.type}');
     }
 
     await setAsCurrent(node);