Fixed incorrect TotalCount when no data is returned (#7671)

Author: glen-84

src/HotChocolate/Core/src/Types.CursorPagination/QueryableCursorPagingHandler.cs

@@ -67,6 +67,7 @@ public async ValueTask<CursorPaginationData<TEntity>> QueryAsync(
             {
                 var originalQuery = executable.Source;
                 var combinedQuery = slicedQuery.Select(t => new { TotalCount = originalQuery.Count(), Item = t });
+                totalCount = 0;
 
                 var index = offset;
                 await foreach (var item in executable

src/HotChocolate/Data/test/Data.EntityFramework.Tests/SqlCursorCursorPagingIntegrationTests.cs

@@ -13,6 +13,8 @@ public class SqlCursorPagingIntegrationTests : SqlLiteCursorTestBase
         new TestData(Guid.NewGuid(), "D"),
     ];
 
+    public TestData[] EmptyData => [];
+
     [Fact]
     public async Task Simple_StringList_Default_Items()
     {
@@ -342,6 +344,27 @@ public async Task Nodes_And_TotalCount()
         result.MatchSnapshot();
     }
 
+    [Fact]
+    public async Task Nodes_And_TotalCount_EmptyData()
+    {
+        // arrange
+        var executor = CreateSchema(EmptyData);
+
+        // act
+        var result = await executor.ExecuteAsync(
+            """
+            {
+                root {
+                    nodes { foo }
+                    totalCount
+                }
+            }
+            """);
+
+        // assert
+        result.MatchSnapshot();
+    }
+
     [Fact]
     public async Task TotalCount_Should_Be_Correct()
     {

src/HotChocolate/Data/test/Data.EntityFramework.Tests/__snapshots__/SqlCursorPagingIntegrationTests.Nodes_And_TotalCount_EmptyData.snap

@@ -0,0 +1,8 @@
+{
+  "data": {
+    "root": {
+      "nodes": [],
+      "totalCount": 0
+    }
+  }
+}