Fix null reference exception in IronPython resolver when class member has a null IReturnType.

src/AddIns/BackendBindings/Python/PythonBinding/Project/Src/PythonMemberResolver.cs

@@ -119,8 +119,12 @@ namespace ICSharpCode.PythonBinding
 		
 		IMember FindMemberInParent(IMember parentMember, string memberName)
 		{
-			IClass parentMemberClass = parentMember.ReturnType.GetUnderlyingClass();
-			return FindMemberInClass(parentMemberClass, memberName);
+			IReturnType returnType = parentMember.ReturnType;
+			if (returnType != null) {
+				IClass parentMemberClass = returnType.GetUnderlyingClass();
+				return FindMemberInClass(parentMemberClass, memberName);
+			}
+			return null;
 		}
 	}
 }

src/AddIns/BackendBindings/Python/PythonBinding/Test/PythonBinding.Tests.csproj

@@ -369,11 +369,13 @@
     <Compile Include="Resolver\ResolveImportsTestFixture.cs" />
     <Compile Include="Resolver\ResolveLocalClassInstanceTests.cs" />
     <Compile Include="Resolver\ResolveLocalVariableMethodTests.cs" />
+    <Compile Include="Resolver\ResolveMemberWhenFieldHasNoReturnTypeTests.cs" />
     <Compile Include="Resolver\ResolveMethodFromUnknownImportAllTests.cs" />
     <Compile Include="Resolver\ResolveMethodReturnValueTests.cs" />
     <Compile Include="Resolver\ResolveMethodWhenFromImportIsUnknownTests.cs" />
     <Compile Include="Resolver\ResolveMethodWhenImportIsUnknownTests.cs" />
     <Compile Include="Resolver\ResolveNullCtrlSpaceParseInfoTestFixture.cs" />
+    <Compile Include="Resolver\ResolveRandomRandintTests.cs" />
     <Compile Include="Resolver\ResolverContextDottedImportedNameMatchTests.cs" />
     <Compile Include="Resolver\ResolverContextGetModulesThatImportEverythingTests.cs" />
     <Compile Include="Resolver\ResolverContextGetModuleForNameImportedAsDifferentNameTestFixture.cs" />

src/AddIns/BackendBindings/Python/PythonBinding/Test/Resolver/ResolveMemberWhenFieldHasNoReturnTypeTests.cs

@@ -0,0 +1,40 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+using ICSharpCode.PythonBinding;
+using ICSharpCode.Scripting.Tests.Utils;
+using ICSharpCode.SharpDevelop.Dom;
+using ICSharpCode.SharpDevelop.Dom.CSharp;
+using NUnit.Framework;
+using PythonBinding.Tests.Utils;
+using UnitTestingUtils = UnitTesting.Tests.Utils;
+
+namespace PythonBinding.Tests.Resolver
+{
+	[TestFixture]
+	public class ResolveMemberWhenFieldHasNoReturnTypeTests
+	{
+		[Test]
+		public void Resolve_FieldHasNoReturnType_DoesNotThrowNullReferenceException()
+		{
+			MockProjectContent projectContent = new MockProjectContent();
+			UnitTestingUtils.MockClass c = new UnitTestingUtils.MockClass(projectContent, "Test");
+			projectContent.SetClassToReturnFromGetClass("self", c);
+			DefaultField field = c.AddField("randomNumber");
+			field.ReturnType = null;
+			ParseInformation parseInfo = new ParseInformation(c.CompilationUnit);
+			
+			ExpressionResult expression = new ExpressionResult("self.randomNumber.randint", ExpressionContext.Default);
+			PythonClassResolver classResolver = new PythonClassResolver();
+			PythonLocalVariableResolver localVariableResolver = new PythonLocalVariableResolver(classResolver);
+			PythonMemberResolver resolver = new PythonMemberResolver(classResolver, localVariableResolver);
+			
+			PythonResolverContext context = new PythonResolverContext(parseInfo, expression, "class Test:\r\npass");
+			Assert.DoesNotThrow(delegate { resolver.Resolve(context); });
+		}
+	}
+}

src/AddIns/BackendBindings/Python/PythonBinding/Test/Resolver/ResolveRandomRandintTests.cs

@@ -0,0 +1,38 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using ICSharpCode.PythonBinding;
+using ICSharpCode.SharpDevelop.Dom;
+using NUnit.Framework;
+using PythonBinding.Tests.Utils;
+
+namespace PythonBinding.Tests.Resolver
+{
+	[TestFixture]
+	public class ResolveRandomRandintTests : ResolveTestsBase
+	{
+		protected override ExpressionResult GetExpressionResult()
+		{
+			return new ExpressionResult("self.randomNumber.randint", ExpressionContext.Default);
+		}
+		
+		protected override string GetPythonScript()
+		{
+			return 
+				"import random\r\n" +
+				"\r\n" +
+				"class Test:\r\n" +
+    			"    def __init__(self):\r\n" +
+			    "        self.randomNumber = random.random()\r\n" +
+			    "        self.randomNumber.randint\r\n" +
+				"\r\n";
+		}
+			
+		[Test]
+		public void Resolve_RandomModuleCannotBeFound_NoNullRefererenceExceptionThrown()
+		{
+			Assert.IsNotNull(resolveResult as PythonMethodGroupResolveResult);
+		}
+	}
+}