message: fix: fix className is null
diff: @@ -637,7 +637,7 @@ export default {
  const { defaultClipPath, customClipPath } = moveable.props;
  const { target, width, height } = state;
  const inputTarget = e.inputEvent ? e.inputEvent.target : null;
  - const className = inputTarget ? inputTarget.getAttribute("class") : "";
  + const className = (inputTarget && inputTarget.getAttribute("class")) || "";
  const datas = e.datas;
  const clipPath = getClipPath(target!, width, height, defaultClipPath || "inset", customClipPath);
  @@ -655,14 +655,9 @@ export default {
  datas.isClipStart = false;
  return false;
  }
  - datas.isControl =
  - className !== null && className.indexOf("clip-control") > -1;
  - datas.isLine =
  - className !== null && className.indexOf("clip-line") > -1;
  - datas.isArea =
  - className !== null &&
  - (className.indexOf("clip-area") > -1 ||
  - className.indexOf("clip-ellipse") > -1);
  + datas.isControl = className && className.indexOf("clip-control") > -1;
  + datas.isLine = className.indexOf("clip-line") > -1;
  + datas.isArea = className.indexOf("clip-area") > -1 || className.indexOf("clip-ellipse") > -1;
  datas.index = inputTarget ? parseInt(inputTarget.getAttribute("data-clip-index"), 10) : -1;
  datas.clipPath = clipPath;
  datas.isClipStart = true;
  