Make last modified date optional

Author: RichDom2185

src/commons/XMLParser/XMLParserHelper.ts

@@ -203,7 +203,6 @@ const makeProgramming = (
     testcases: publicTestcases.map(testcase => makeTestcase(testcase)),
     testcasesPrivate: privateTestcases.map(testcase => makeTestcase(testcase)),
     answer: solution ? (solution[0] as string).trim() : '',
-    lastModifiedAt: new Date().toISOString(),
     type: 'programming'
   };
   if (problem.SNIPPET[0].GRADER) {

src/commons/assessment/AssessmentTypes.ts

@@ -100,7 +100,7 @@ export type AssessmentConfiguration = {
 
 export interface IProgrammingQuestion extends BaseQuestion {
   answer: string | null;
-  lastModifiedAt: string;
+  lastModifiedAt?: string;
   autogradingResults: AutogradingResult[];
   graderTemplate?: string;
   prepend: string;