fix(性能测试): 修复性能测试不能复制的问题

Closes 298

backend/src/main/java/io/metersphere/performance/service/PerformanceTestService.java

@@ -34,6 +34,7 @@ import org.springframework.transaction.annotation.Transactional;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.annotation.Resource;
 import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.net.Socket;
@@ -42,8 +43,6 @@ import java.time.temporal.ChronoUnit;
 import java.util.*;
 import java.util.stream.Collectors;
 
-import javax.annotation.Resource;
-
 @Service
 @Transactional(rollbackFor = Exception.class)
 public class PerformanceTestService {
@@ -381,6 +380,10 @@ public class PerformanceTestService {
         if (!CollectionUtils.isEmpty(loadTestFiles)) {
             loadTestFiles.forEach(loadTestFile -> {
                 FileMetadata fileMetadata = fileService.copyFile(loadTestFile.getFileId());
+                if (fileMetadata == null) {
+                    // 如果性能测试出现文件变更，这里会有 null
+                    return;
+                }
                 loadTestFile.setTestId(copy.getId());
                 loadTestFile.setFileId(fileMetadata.getId());
                 loadTestFileMapper.insert(loadTestFile);

backend/src/main/java/io/metersphere/service/FileService.java

@@ -60,6 +60,10 @@ public class FileService {
         FileContentExample example2 = new FileContentExample();
         example2.createCriteria().andFileIdIn(ids);
         fileContentMapper.deleteByExample(example2);
+
+        LoadTestFileExample example3 = new LoadTestFileExample();
+        example3.createCriteria().andFileIdIn(ids);
+        loadTestFileMapper.deleteByExample(example3);
     }
 
     public FileMetadata saveFile(MultipartFile file) {