fix(测试跟踪): 步骤类型为文本描述的用例导入后，无法查看变更记录

--bug=1041825 --user=陈建星 【测试跟踪】github#31266，批量导入的功能用例，再次编辑更新时，没有变更记录 https://www.tapd.cn/55049933/s/1550243

framework/sdk-parent/sdk/src/main/java/io/metersphere/log/service/OperatingLogService.java

@@ -135,7 +135,7 @@ public class OperatingLogService {
                     columns.stream().forEach(column -> {
                         if (StringUtils.isNotEmpty(column.getColumnTitle())) {
                             if (StringUtils.equalsIgnoreCase(TestCaseReference.testCaseColumns.get(column.getColumnName()), column.getColumnTitle())) {
-                                column.setOriginalValue(Translator.get(column.getOriginalValue().toString()).replace("Not Support Key:", ""));
+                                column.setOriginalValue(Translator.get(Optional.ofNullable(column.getOriginalValue()).orElse(StringUtils.EMPTY).toString()).replace("Not Support Key:", ""));
                                 column.setNewValue(Translator.get(column.getNewValue().toString()).replace("Not Support Key:", ""));
                             }
                             String columnsTitle = Translator.get(column.getColumnTitle());

test-track/backend/src/main/java/io/metersphere/excel/listener/TestCaseNoModelDataListener.java

@@ -647,6 +647,7 @@ public class TestCaseNoModelDataListener extends AnalysisEventListener<Map<Integ
                 && StringUtils.equals(data.getStepModel(), TestCaseConstants.StepModel.TEXT.name())) {
             testCase.setStepDescription(data.getStepDesc());
             testCase.setExpectedResult(data.getStepResult());
+            testCase.setSteps("[]");
         } else {
             String steps = getSteps(data);
             testCase.setSteps(steps);