message: Fix bug which stopped Find from working when no frames are present
diff: @@ -88,7 +88,7 @@ class FindWidget {
  const termViewers = this._getViewers();
  const needleRegExp = this._needleRegExp();
  - for (let i=termViewers.length-1; i> 0; i--) {
  + for (let i=termViewers.length-1; i>=0; i--) {
  if (termViewers[i].find(needleRegExp, { backwards: true, startPosition: FindStartPosition.DOCUMENT_END })) {
  break;
  }
  @@ -180,7 +180,7 @@ class FindWidget {
  }
  i--;
  - for ( ; i > 0; i--) {
  + for ( ; i >= 0; i--) {
  if (termViewers[i].find(needleRegExp, { startPosition: FindStartPosition.DOCUMENT_END, backwards: true })) {
  return;
  }
  