message: Fix multiline test in CIF writer
diff: @@ -164,7 +164,7 @@ function writeCifLoop(category: Category, instance: Category.Instance, source: C
  }
  function isMultiline(value: string) {
  - return !!value && value.indexOf('\n') >= 0;
  + return typeof value === 'string' && value.indexOf('\n') >= 0;
  }
  function writeLine(builder: StringBuilder, val: string) {
  