Fix null reference issue in GraphQL/Request Error handling of HttpStatusCode.

Author: cajuncoding

FlurlGraphQL.Querying/Flurl/FlurlGraphQLRequest.cs

@@ -356,14 +356,14 @@ protected async Task<FlurlGraphQLResponse> ExecuteRequestWithExceptionHandling(F
             }
             catch (FlurlHttpException httpException)
             {
-                var httpStatusCode = (HttpStatusCode)httpException.StatusCode;
+                var httpStatusCode = (HttpStatusCode?)httpException?.StatusCode;
                 var errorContent = await httpException.GetResponseStringSafelyAsync().ConfigureAwait(false);
 
-                if (httpStatusCode == HttpStatusCode.BadRequest)
+                if (httpStatusCode is HttpStatusCode.BadRequest)
                     throw new FlurlGraphQLException(
                         $"[{(int)HttpStatusCode.BadRequest}-{HttpStatusCode.BadRequest}] The GraphQL server returned a bad request response for the query."
                         + " This is likely caused by a malformed, or non-parsable query; validate the query syntax, operation name, arguments, etc."
-                        + " to ensure that the query is valid.", this.GraphQLQuery, errorContent, httpStatusCode, httpException
+                        + " to ensure that the query is valid.", this.GraphQLQuery, errorContent, httpStatusCode.Value, httpException
                     );
                 else
                     throw;

FlurlGraphQL.Querying/FlurlGraphQL.Querying.csproj

@@ -2,9 +2,9 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
-		<Version>1.3.0</Version>
-		<AssemblyVersion>1.3.0</AssemblyVersion>
-		<FileVersion>1.3.0</FileVersion>
+		<Version>1.3.1</Version>
+		<AssemblyVersion>1.3.1</AssemblyVersion>
+		<FileVersion>1.3.1</FileVersion>
 		<Authors>BBernard / CajunCoding</Authors>
 		<Company>CajunCoding</Company>
 		<Description>GraphQL client extensions for Flurl.Http -- lightweight, simplified, asynchronous, fluent GraphQL client API extensions for the amazing Flurl Http library!</Description>
@@ -14,6 +14,7 @@
 		<RepositoryUrl>https://github.com/cajuncoding/FlurlGraphQL</RepositoryUrl>
 		<PackageReleaseNotes>
 			Release Notes:
+			- Full Null reference issue in GraphQL/Request Error handling of HttpStatusCode.
 			- Added better support for Mutation handling so that single payload (per Mutation convention best practices) can be returned easily via ReceiveGraphQLMutationResult;
 			this eliminates the need to use ReceiveGraphQLRawJsonResponse for dynamic Mutation response handling.
 			- Fixed bug to ensure Errors are returned on IGraphQLQueryResults when possible (not available on Batch Queries).