Use 204 on empty delete response

Author: medokin

src/JsonApiDotNetCore/Controllers/JsonApiController.cs

@@ -201,7 +201,7 @@ public virtual async Task<IActionResult> DeleteAsync(TId id)
             if (!wasDeleted)
                 return NotFound();
 
-            return Ok();
+            return NoContent();
         }
 
         private IQueryable<T> ApplySortAndFilterQuery(IQueryable<T> entities)

test/JsonApiDotNetCoreExampleTests/Acceptance/Spec/DeletingDataTests.cs

@@ -55,7 +55,7 @@ public async Task Respond_404_If_EntityDoesNotExist()
             var response = await client.SendAsync(request);
 
             // Assert
-            Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+            Assert.Equal(HttpStatusCode.NoContent, response.StatusCode);
         }
     }
 }