squash. make connectivity check stronger

Author: korydraughn

irods/src/main/java/ch/cyberduck/core/irods/IRODSSession.java

@@ -72,6 +72,11 @@ public IRODSSession(final Host h, final X509TrustManager trust, final X509KeyMan
         super(h, trust, key);
     }
 
+    @Override
+    public boolean isConnected() {
+        return super.isConnected() && null != client && client.isConnected();
+    }
+
     @Override
     protected IRODSConnection connect(final ProxyFinder proxy, final HostKeyCallback key, final LoginCallback prompt, final CancelCallback cancel) throws BackgroundException {
         try {
@@ -136,7 +141,7 @@ protected void logout() {
     @Override
     protected void disconnect() {
         try {
-            if(client != null) {
+            if(null != client) {
                 client.disconnect();
                 client = null;
                 log.debug("disconnected from iRODS server.");
@@ -145,6 +150,8 @@ protected void disconnect() {
         catch(Exception e) {
             log.error(e.getMessage());
         }
+
+        super.disconnect();
     }
 
     @Override