Fix ValueError: I/O operation on closed file.

src/prompt_toolkit/application/current.py

@@ -53,15 +53,15 @@ def __repr__(self) -> str:
 
     @property
     def input(self) -> Input:
-        if self._input is None:
+        if self._input is None or self._input.closed:
             from prompt_toolkit.input.defaults import create_input
 
             self._input = create_input()
         return self._input
 
     @property
     def output(self) -> Output:
-        if self._output is None:
+        if self._output is None or (self._output.stdout and self._output.stdout.closed):
             from prompt_toolkit.output.defaults import create_output
 
             self._output = create_output()