Fix 500 when deleting a dismissed review (go-gitea#27903)

Fix go-gitea#27767 
Add a test to ensure its behavior

Author: lng2020

models/issues/review.go

@@ -897,6 +897,16 @@ func DeleteReview(ctx context.Context, r *Review) error {
 		return err
 	}
 
+	opts = FindCommentsOptions{
+		Type:     CommentTypeDismissReview,
+		IssueID:  r.IssueID,
+		ReviewID: r.ID,
+	}
+
+	if _, err := sess.Where(opts.ToConds()).Delete(new(Comment)); err != nil {
+		return err
+	}
+
 	if _, err := sess.ID(r.ID).Delete(new(Review)); err != nil {
 		return err
 	}

models/issues/review_test.go

@@ -8,6 +8,7 @@ import (
 
 	"code.gitea.io/gitea/models/db"
 	issues_model "code.gitea.io/gitea/models/issues"
+	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
 
@@ -258,3 +259,32 @@ func TestDeleteReview(t *testing.T) {
 	assert.NoError(t, err)
 	assert.True(t, review1.Official)
 }
+
+func TestDeleteDismissedReview(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 2})
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issue.RepoID})
+	review, err := issues_model.CreateReview(db.DefaultContext, issues_model.CreateReviewOptions{
+		Content:  "reject",
+		Type:     issues_model.ReviewTypeReject,
+		Official: false,
+		Issue:    issue,
+		Reviewer: user,
+	})
+	assert.NoError(t, err)
+	assert.NoError(t, issues_model.DismissReview(db.DefaultContext, review, true))
+	comment, err := issues_model.CreateComment(db.DefaultContext, &issues_model.CreateCommentOptions{
+		Type:     issues_model.CommentTypeDismissReview,
+		Doer:     user,
+		Repo:     repo,
+		Issue:    issue,
+		ReviewID: review.ID,
+		Content:  "dismiss",
+	})
+	assert.NoError(t, err)
+	unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: comment.ID})
+	assert.NoError(t, issues_model.DeleteReview(db.DefaultContext, review))
+	unittest.AssertNotExistsBean(t, &issues_model.Comment{ID: comment.ID})
+}