Fixed nil deref error on no filter, fixed no results

graphql/resolver/queries/stories.go

@@ -35,7 +35,10 @@ func (r *QueryResolver) Stories(ctx context.Context, args *StoriesArg) ([]*types
 		author = *filter.Author
 	}
 
-	category := filter.Category
+	category := ""
+	if filter != nil && filter.Category != nil {
+		category = *filter.Category
+	}
 
 	tags := make([]story.Tag, 0, 8)
 	if filter != nil && filter.Tags != nil {

model/story/story.go

@@ -193,14 +193,14 @@ func FindID(id string) (Story, error) {
 }
 
 // List lists stories by any non-zero criteria passed with it.
-func List(author string, category *string, tags []Tag, earliest, latest time.Time, unlisted bool, open *bool, limit int) ([]Story, error) {
+func List(author string, category string, tags []Tag, earliest, latest time.Time, unlisted bool, open *bool, limit int) ([]Story, error) {
 	query := bson.M{}
 
 	if author != "" {
 		query["author"] = author
 	}
 
-	if category != nil {
+	if category != "" {
 		query["category"] = category
 	}
 
@@ -223,7 +223,9 @@ func List(author string, category *string, tags []Tag, earliest, latest time.Tim
 		}
 	}
 
-	query["unlisted"] = unlisted
+	if unlisted {
+		query["listed"] = false
+	}
 
 	if open != nil {
 		query["open"] = *open