Fixed bug and simplified code for finding significant digits

Author: KarlLundengaard

app/evaluation.py

@@ -261,7 +261,7 @@ def evaluation_function(response, answer, params, include_test_data=False) -> di
 
     reserved_expressions_success, reserved_expressions = parse_reserved_expressions(reserved_expressions_strings, parameters, evaluation_result)
     if reserved_expressions_success is False:
-        return evaluation_result
+        return evaluation_result.serialise(include_test_data)
     reserved_expressions_parsed = {**reserved_expressions["learner"], **reserved_expressions["task"]}
     parameters.update({"reserved_keywords": parameters["context"]["reserved_keywords"]+list(reserved_expressions_parsed.keys())})
 

app/utility/expression_utilities.py

@@ -424,13 +424,7 @@ def compute_relative_tolerance_from_significant_decimals(string):
                 separator_indices.append(len(string))
         index = min(separator_indices)
         significant_characters = string[0:index].replace(".", "")
-        index = 0
-        for c in significant_characters:
-            if c in "-0":
-                index += 1
-            else:
-                break
-        significant_characters = significant_characters[index:]
+        significant_characters = significant_characters.lstrip("-0")
         rtol = 5*10**(-len(significant_characters))
     return rtol