Check input combinations

src/delete.ts

@@ -49,6 +49,10 @@ export function deleteVersions(input: Input): Observable<boolean> {
     return throwError('No token found')
   }
 
+  if (!input.checkInput()) {
+    return throwError('Invalid input combination')
+  }
+
   if (input.numOldVersionsToDelete <= 0) {
     console.log(
       'Number of old versions to delete input is 0 or less, no versions will be deleted'