CLN: Fix equals empty list with bool expression

Author: patrick

pandas/core/reshape/reshape.py

@@ -338,7 +338,7 @@ def _unstack_multiple(data, clocs, fill_value=None):
     comp_ids, obs_ids = compress_group_index(group_index, sort=False)
     recons_codes = decons_obs_group_ids(comp_ids, obs_ids, shape, ccodes, xnull=False)
 
-    if rlocs == []:
+    if not rlocs:
         # Everything is in clocs, so the dummy df has a regular index
         dummy_index = Index(obs_ids, name="__placeholder__")
     else: