added more nullptr checks

rsmcore/session.cc

@@ -324,7 +324,11 @@ SFTPDir::~SFTPDir()
 
 bool SFTPDir::isOpen() { return (p->dir != nullptr); }
 
-bool SFTPDir::hasNext() { return (0 == sftp_dir_eof(p->dir)); }
+bool SFTPDir::hasNext()
+{
+  if (nullptr == p->dir) return false;
+  return (0 == sftp_dir_eof(p->dir));
+}
 
 // returns SFTPAttributes structure on success or nullptr on failure
 // caller is responsible for deleting returned SFTPAttributes structure
@@ -368,6 +372,7 @@ SFTPAttributes* SFTPDir::next()
 
 bool SFTPDir::close()
 {
+  if (nullptr == p->dir) return true;
   int rc = sftp_closedir(p->dir);
   if (SSH_NO_ERROR == rc)
   {