Fixed bug where code actions could be null.

ICSharpCode.NRefactory.CSharp/Ast/GeneralScope/TypeParameterDeclaration.cs

@@ -79,7 +79,16 @@ namespace ICSharpCode.NRefactory.CSharp
 				SetChildByRole (Roles.Identifier, value);
 			}
 		}
-		
+
+		public TypeParameterDeclaration ()
+		{
+		}
+
+		public TypeParameterDeclaration (string name)
+		{
+			Name = name;
+		}
+
 		public override void AcceptVisitor (IAstVisitor visitor)
 		{
 			visitor.VisitTypeParameterDeclaration (this);

ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssue.cs

@@ -59,7 +59,7 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 			Actions = action ?? Enumerable.Empty<CodeAction> ();
 		}
 		
-		public CodeIssue(string description, TextLocation start, TextLocation end, CodeAction action) : this (description, start, end, new [] { action })
+		public CodeIssue(string description, TextLocation start, TextLocation end, CodeAction action) : this (description, start, end, action != null ? new [] { action } : null)
 		{
 		}
 	}