fixup

Author: MarcoGorelli

pandas/core/interchange/column.py

@@ -362,10 +362,9 @@ def _get_validity_buffer(self) -> tuple[PandasBuffer, Any]:
 
         if isinstance(self._col.dtype, ArrowDtype):
             arr = self._col.array
-            buf = arr._pa_array.chunks[0].buffers()[0]
             dtype = (DtypeKind.BOOL, 1, ArrowCTypes.BOOL, Endianness.NATIVE)
-            if buf is None:
-                return buf, dtype
+            if all(chunk.buffers()[0] is None for chunk in arr._pa_array.chunks):
+                return None, dtype
             buffer = PandasBufferPyarrow(
                 arr._pa_array, is_validity=True, allow_copy=self._allow_copy
             )