fix: null reference.

Author: Pathoschild

Client/Default/Request.cs

@@ -119,7 +119,7 @@ public virtual IRequest WithArguments(object arguments)
 
 			var query = this.Message.RequestUri.ParseQueryString();
 			foreach (var pair in dictionary)
-				query.Add(pair.Key, pair.Value.ToString());
+				query.Add(pair.Key, (pair.Value ?? "").ToString());
 			string uri = this.Message.RequestUri.GetLeftPart(UriPartial.Path) + "?" + query;
 			this.Message.RequestUri = new Uri(uri);
 

Client/Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.4.0.4")]
-[assembly: AssemblyFileVersion("0.4.0.4")]
+[assembly: AssemblyVersion("0.4.0.5")]
+[assembly: AssemblyFileVersion("0.4.0.5")]

Client/package.nuspec

@@ -2,7 +2,7 @@
 <package>
 	<metadata>
 		<id>Pathoschild.Http.FluentClient</id>
-		<version>0.4.0-alpha4</version>
+		<version>0.4.0-alpha5</version>
 		<authors>Jesse Plamondon-Willard</authors>
 		<description>A fluent, strongly-typed HTTP client built on top of Microsoft's .NET 4.5 HttpClient.</description>
 		<tags>api wcf web webapi</tags>