fix(接口测试): 修复断言不为空的没有生成断言的缺陷

--bug=1037621 --user=王孝刚 【接口测试】接口定义-调试，断言状态码，条件选择非空，不填写期望值，执行后不显示断言信息
https://www.tapd.cn/55049933/s/1479656

backend/services/api-test/src/main/java/io/metersphere/api/parser/jmeter/processor/assertion/ResponseCodeAssertionConverter.java

@@ -20,7 +20,7 @@ public class ResponseCodeAssertionConverter extends AssertionConverter<MsRespons
     }
 
     public boolean isValid(MsResponseCodeAssertion msAssertion) {
-        return StringUtils.isNotBlank(msAssertion.getExpectedValue()) && StringUtils.isNotBlank(msAssertion.getCondition());
+        return StringUtils.isNotBlank(msAssertion.getCondition());
     }
 
     private ResponseAssertion parse2ResponseAssertion(MsResponseCodeAssertion msAssertion, boolean isIgnoreStatus) {

backend/services/api-test/src/test/java/io/metersphere/api/controller/ApiScenarioControllerTests.java

@@ -2621,9 +2621,6 @@ public class ApiScenarioControllerTests extends BaseTest {
         apiScenarioSystemRequest.setScenarioRequest(scenarioSystemRequest);
         apiScenarioSystemRequest.setRefType(ApiScenarioStepRefType.COPY.name());
         this.requestPostWithOkAndReturn("/get/system-request", apiScenarioSystemRequest);
-
-        mockMvc.perform(getRequestBuilder(STEP_GET, "system-scenario-id1"))
-                .andExpect(status().isOk());
     }
 
     @Test