BUG: Fix eval's empty scopes not working

Author: Alexander Lakeev

pandas/core/computation/scope.py

@@ -133,11 +133,11 @@ def __init__(
             # shallow copy here because we don't want to replace what's in
             # scope when we align terms (alignment accesses the underlying
             # numpy array of pandas objects)
-            scope_global = self.scope.new_child((global_dict or frame.f_globals).copy())
+            scope_global = self.scope.new_child((global_dict if global_dict is not None else frame.f_globals).copy())
             self.scope = DeepChainMap(scope_global)
             if not isinstance(local_dict, Scope):
                 scope_local = self.scope.new_child(
-                    (local_dict or frame.f_locals).copy()
+                    (local_dict if local_dict is not None else frame.f_locals).copy()
                 )
                 self.scope = DeepChainMap(scope_local)
         finally: