Fixed minor issues and enhancements

src/core/builtin_helpers.py

@@ -72,6 +72,9 @@ def expect_one(context, return_values):
             sheerka.new(BuiltinConcepts.IS_EMPTY, body=return_values),
             parents=return_values)
 
+    if len(return_values) == 1:
+        return return_values[0]
+
     successful_results = [item for item in return_values if item.status]
     number_of_successful = len(successful_results)
     # total_items = len(return_values)
@@ -113,7 +116,7 @@ def expect_one(context, return_values):
         return sheerka.ret(
             context.who,
             False,
-            return_values[0],
+            return_values[0].body,
             parents=return_values)
     else:
         # test if only one evaluator in error