Refactored sheerka execution flow + Enhanced log management

tests/test_ConceptLexerParser.py

@@ -729,6 +729,18 @@ def test_i_can_detect_indirect_infinite_recursion_with_sequence_or_ordered_choic
     assert bar not in parser.concepts_grammars  # removed because of the infinite recursion
 
 
+def test_infinite_recursion_does_not_fail_if_a_concept_is_missing():
+    foo = Concept(name="foo")
+    bar = Concept(name="bar")
+
+    concepts = {
+        foo: bar
+    }
+    parser = ConceptLexerParser()
+    parser.initialize(get_context(), concepts)
+
+    assert foo in parser.concepts_grammars
+
 def test_i_can_detect_indirect_infinite_recursion_with_optional():
     # TODO infinite recursion with optional
     pass