UI: file_actions: Convert "icon" to empty str if it is None [ci skip]

Signed-off-by: Alexander Piskun <bigcat88@icloud.com>

Author: bigcat88

nc_py_api/ex_app/ui/files_actions.py

@@ -53,7 +53,7 @@ def order(self) -> int:
     @property
     def icon(self) -> str:
         """-no description-."""
-        return self._raw_data["icon"]
+        return self._raw_data["icon"] if self._raw_data["icon"] else ""
 
     @property
     def action_handler(self) -> str: