1.修复数据存入磁盘,有文件但是文件内容为空的情况.应该需要重新进行数据源fetch操作比如(网络下载)

Signed-off-by: zhoulisheng1 <zhoulisheng1@huawei.com>

imageknife/src/main/ets/components/imageknife/RequestOption.ets

@@ -450,7 +450,6 @@ export class RequestOption {
 
   loadError(err) {
     LogUtil.log("loadError:" + err);
-    LogUtil.log("loadError stack=:" + JSON.stringify(err.stack));
     //失败占位图展示规则
     if (this.retryholderFunc) {
       // 重试图层优先于加载失败展示

imageknife/src/main/ets/components/imageknife/requestmanage/RequestManager.ets

@@ -245,7 +245,7 @@ export class RequestManager {
   private loadDiskFromSource(request: RequestOption, onComplete, onError) {
     LogUtil.log("RequestManager loadDiskFromSource")
     let cached = this.mDiskCacheProxy.getValue(request.generateDataKey)
-    if (cached != null) {
+    if (cached != null && cached.byteLength > 0) {
       this.parseDiskFile2PixelMap(request, cached, onComplete, onError)
     } else {
       this.mStage = Stage.SOURCE;