fix sftp protocol link not exist bug

elfinder/sftpstoragedriver/sftpstorage.py

@@ -231,7 +231,6 @@ class SFTPStorageFile(File):
         if not self._is_read:
             self.file = self._storage._read(self._name)
             self._is_read = True
-
         return self.file.read(num_bytes)
 
     def write(self, content):

elfinder/volumes/storage.py

@@ -223,8 +223,14 @@ class ElfinderVolumeStorage(ElfinderVolumeDriver):
         """
         stat = {}
 
+        # fix sftp link not exist can not open bug
         if not self._options['storage'].exists(path):
-            raise os.error
+            stat['size'] = 'unknown'
+            stat['mime'] = 'symlink-broken'
+            stat['read'] = False
+            stat['write'] = False
+            return stat
+            # raise os.error
 
         try:
             stat['mime'] = self.mimetype(path)