message: [ts] Builder incorrectly serializing empty strings
  * [ts] Builder incorrectly serializing empty strings
  The builder was returning an offset of zero for empty strings. This is
  leading to flatbuffers which fail verification in other languages, such
  as Rust.
  * tests expect 0 offset for null or undefined strings
diff: @@ -522,8 +522,11 @@ export class Builder {
  * @param s The string to encode
  * @return The offset in the buffer where the encoded string starts
  */
  - createString(s: string | Uint8Array): Offset {
  - if (!s) { return 0 }
  + createString(s: string | Uint8Array | null | undefined): Offset {
  + if (s === null || s === undefined) {
  + return 0;
  + }
  +
  let utf8: string | Uint8Array | number[];
  if (s instanceof Uint8Array) {
  utf8 = s;
  