fix: 当extra字段为空时，提示报错

src/modules/algo-params-setting-base/components/CameraViewSetting/CameraViewSetting.vue

@@ -175,6 +175,10 @@
 
     const extraStr = selectedAlgoDetail.extra;
     const extraJSON = JSON.parse(extraStr);
+    if (!extraJSON) {
+      ElMessage.error('extra字段为 null, 无法保存');
+      return;
+    }
 
     cameraAlgoStore.selectedAlgoDetail.regionJudge = nextStatus;