Change order, simplify condition

pandas/core/indexing.py

@@ -2444,12 +2444,9 @@ def check_bool_indexer(index: Index, key) -> np.ndarray:
  'indexer (index of the boolean Series and of '
  'the indexed object do not match).')
  result = result.astype(bool)._values
- elif is_sparse(result):
- result = result.to_dense()
- result = np.asarray(result, dtype=bool)
  else:
- # is_bool_indexer has already checked for nulls in the case of an
- # object array key, so no check needed here
+ if is_sparse(result):
+  result = result.to_dense()
  result = np.asarray(result, dtype=bool)
 
  # GH26658