fix SSHClient.exec

lib/data/provider/apt.dart

@@ -99,7 +99,7 @@ class AptProvider extends BusyProvider {
           onStdout: (data, sink) {
             updateLog = (updateLog ?? '') + data;
             notifyListeners();
-            onUpdate!();
+            if (onUpdate != null) onUpdate!();
           },
         );
         return await client
@@ -120,13 +120,13 @@ class AptProvider extends BusyProvider {
 
     await client!.exec(
       _wrap(upgradeCmd),
-      onStderr: (data, sink) => _onPwd(data, sink),
+      onStderr: _onPwd,
       onStdout: (log, sink) {
         if (lastLog == log.trim()) return;
         upgradeLog = (upgradeLog ?? '') + log;
         lastLog = log.trim();
         notifyListeners();
-        onUpgrade!();
+        if (onUpgrade != null) onUpgrade!();
       },
     );
 

lib/data/provider/docker.dart

@@ -30,7 +30,6 @@ class DockerProvider extends BusyProvider {
   DockerErr? error;
   PwdRequestFunc? onPwdReq;
   String? hostId;
-  String? runLog;
   bool isRequestingPwd = false;
 
   void init(SSHClient client, String userName, PwdRequestFunc onPwdReq,
@@ -44,7 +43,7 @@ class DockerProvider extends BusyProvider {
   void clear() {
     client = userName = error = items = version = edition = onPwdReq = null;
     isRequestingPwd = false;
-    hostId = runLog = null;
+    hostId = null;
   }
 
   Future<void> refresh() async {
@@ -124,14 +123,8 @@ class DockerProvider extends BusyProvider {
     final code = await client!.exec(
       _wrapHost(cmd),
       onStderr: _onPwd,
-      onStdout: (data, _) {
-        runLog = '$runLog$data';
-        notifyListeners();
-      },
     );
 
-    runLog = null;
-
     if (code != 0) {
       setBusyState(false);
       return DockerErr(type: DockerErrType.unknown, message: errs.join('\n'));