代码优化，防止空指针

magic-api/src/main/java/org/ssssssss/magicapi/core/web/MagicWorkbenchController.java

@@ -149,7 +149,7 @@ public class MagicWorkbenchController extends MagicController implements MagicEx
 	@GetMapping("/plugins")
 	@Valid(requireLogin = false)
 	@ResponseBody
-	public JsonBean<List<Plugin>> plugins(){
+	public JsonBean<List<Plugin>> plugins() {
 		return new JsonBean<>(plugins);
 	}
 
@@ -265,7 +265,9 @@ public class MagicWorkbenchController extends MagicController implements MagicEx
 	public JsonBean<Boolean> upload(MultipartFile file, String mode, HttpServletRequest request) throws IOException {
 		notNull(file, FILE_IS_REQUIRED);
 		isTrue(allowVisit(request, Authorization.UPLOAD), PERMISSION_INVALID);
-		configuration.getMagicBackupService().doBackupAll("上传前，系统自动全量备份", WebUtils.currentUserName());
+		if (configuration.getMagicBackupService() != null) {
+			configuration.getMagicBackupService().doBackupAll("上传前，系统自动全量备份", WebUtils.currentUserName());
+		}
 		return new JsonBean<>(magicAPIService.upload(file.getInputStream(), mode));
 	}
 
@@ -288,7 +290,9 @@ public class MagicWorkbenchController extends MagicController implements MagicEx
 		notNull(file, SIGN_IS_INVALID);
 		byte[] bytes = IoUtils.bytes(file.getInputStream());
 		isTrue(sign.equals(SignUtils.sign(timestamp, secretKey, mode, bytes)), SIGN_IS_INVALID);
-		configuration.getMagicBackupService().doBackupAll("推送前，系统自动全量备份", WebUtils.currentUserName());
+		if (configuration.getMagicBackupService() != null) {
+			configuration.getMagicBackupService().doBackupAll("推送前，系统自动全量备份", WebUtils.currentUserName());
+		}
 		magicAPIService.upload(new ByteArrayInputStream(bytes), mode);
 		return new JsonBean<>();
 	}