message: fix stroke animation from #fff to null.
diff: @@ -1604,11 +1604,10 @@ function animateToShallow<T>(
  for (let k = 0; k < targetKeys.length; k++) {
  const innerKey = targetKeys[k] as string;
  - if (target[innerKey] == null) { // Can't animate to a null/undefined value.
  - continue;
  - }
  -
  - if (source[innerKey] != null && (animateAll || (animationProps as Dictionary<any>)[innerKey])) {
  + if (source[innerKey] != null
  + && target[innerKey] != null // Can't animate between null value. assign directly. For example. stroke animate from #fff to null.
  + && (animateAll || (animationProps as Dictionary<any>)[innerKey])
  + ) {
  if (isObject(target[innerKey]) && !isArrayLike(target[innerKey])) {
  if (topKey) {
  // logError('Only support 1 depth nest object animation.');
  