Merge branch 'feature/exam' into test

合并冲突

src/Hotline.Application/Exam/Service/Practices/PracticeService.cs

@@ -38,6 +38,7 @@ using XF.Domain.Authentications;
 using XF.Domain.Dependency;
 using Hotline.Repository.SqlSugar.Exam.Service;
 using Hotline.Repository.SqlSugar.Exam.Extensions;
+using Exam.Infrastructure.Extensions;
 
 namespace Hotline.Application.Exam.Service.Practices
 {
@@ -321,6 +322,8 @@ namespace Hotline.Application.Exam.Service.Practices
         }
         private async Task<PracticeQuestionDto> QueryPracticeQuestion(PracticeQuestionRequest practiceQuestionRequest)
         {
+            if (practiceQuestionRequest.PracticeQuestionId.IsNullOrEmpty()) return null;
+
             var practiceQuestion = await _practiceQuestionRepository.GetAsync(x => x.Id == practiceQuestionRequest.PracticeQuestionId);
 
             var practiceQuestionDto = _mapper.Map<PracticeQuestionDto>(practiceQuestion);