message: fixed problem with doc_gen (TypeError: Cannot read property 'getQuestionTitlePatternOptions' of null)
diff: @@ -4732,6 +4732,7 @@ Serializer.addClass("survey", [
  default: "numTitleRequire",
  dependsOn: ["questionStartIndex", "requiredText"],
  choices: (obj: any) => {
  + if (!obj) return [];
  return obj.getQuestionTitlePatternOptions();
  }
  },
  