Remove validation rule to make paths and webhooks optional

Author: MaggieKimani1

src/Microsoft.OpenApi/Reader/ParsingContext.cs

@@ -276,11 +276,6 @@ private void ValidateRequiredFields(OpenApiDocument doc, string version)
                 // paths is a required field in OpenAPI 3.0 but optional in 3.1
                 RootNode.Context.Diagnostic.Errors.Add(new OpenApiError("", $"Paths is a REQUIRED field at {RootNode.Context.GetLocation()}"));
             }
-            else if (version.is3_1() && (doc.Paths == null || !doc.Paths.Any()) && (doc.Webhooks == null || !doc.Webhooks.Any()))
-            {
-                RootNode.Context.Diagnostic.Errors.Add(new OpenApiError(
-                    "", $"The document MUST contain either a Paths or Webhooks field at {RootNode.Context.GetLocation()}"));
-            }
         }
     }
 }