feat:离线支持

android/app/src/main/java/io/flutter/plugins/facediscern/flutter/FlutterTool.java

@@ -240,7 +240,7 @@ public class FlutterTool {
                 Log.e(TAG, "registerFaceByDatabase,方法错误,file读取错误error:" + e.getMessage() + "json:" + new Gson().toJson(v), e);
                 continue;
             }
-            if (bytes == null) {
+            if (bytes == null || bytes.length == 0) {
                 errorSampleIdList.add(v.getSampleId());
                 Log.e(TAG, "registerFaceByDatabase,方法错误" + v.getUserName() + "bytes is null," + "json:" + new Gson().toJson(v));
                 continue;