Fixed parsing of BNF concepts mixed with isaset concepts

tests/core/test_SheerkaEvaluateConcept.py

@@ -1,6 +1,6 @@
 import pytest
 from core.builtin_concepts import BuiltinConcepts, ReturnValueConcept, ParserResultConcept
-from core.concept import Concept, DoNotResolve, ConceptParts, Property, InfiniteRecursionResolved, CB
+from core.concept import Concept, DoNotResolve, ConceptParts, Property, InfiniteRecursionResolved, CB, NotInit
 from parsers.PythonParser import PythonNode
 
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
@@ -65,7 +65,7 @@ class TestSheerkaEvaluateConcept(TestUsingMemoryBasedSheerka):
         assert len(evaluated.values) == 0 if expr is None else 1
 
     @pytest.mark.parametrize("expr, expected", [
-        (None, None),
+        (None, NotInit),
         ("", ""),
         ("1", 1),
         ("1+1", 2),