Add early return for empty contentTypes array

Added a check to ensure that if the `contentTypes` array is empty, the method returns an empty array immediately. This prevents unnecessary processing and potential errors when no content types are provided.

src/XperienceCommunity.DataRepository/PageTypeRepository.cs

@@ -229,6 +229,11 @@ public async Task<IEnumerable<IWebPageFieldsSource>> GetByPathAsync<T1, T2>(stri
             typeof(T1).GetContentTypeName(), typeof(T2).GetContentTypeName()
         ];
 
+        if (contentTypes.Length == 0)
+        {
+            return [];
+        }
+
         var builder = new ContentItemQueryBuilder()
             .ForContentTypes(
                 config =>