Strict done!!

overlord/src/app/cash-flow/cash-flow.service.ts

@@ -16,7 +16,11 @@ const serviceName = 'CashFlowService';
 export class CashFlowService {
   constructor(private http: HttpClient, private log: ErrorLoggerService) {}
 
-  list(id: string, startDate: string, finishDate: string): Observable<CashFlow> {
+  list(
+    id: string | null,
+    startDate: string | null,
+    finishDate: string | null,
+  ): Observable<CashFlow> {
     const options = { params: new HttpParams() };
     if (startDate !== null) {
       options.params = options.params.set('s', startDate);