Fix NullReferenceException in AssemblyTreeNode.get_ToolTip

ICSharpCode.Decompiler/CSharp/Transforms/DeclareVariables.cs

@@ -39,6 +39,10 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 		/// </summary>
 		struct InsertionPoint
 		{
+			/// <summary>
+			/// The nesting level of `nextNode` within the AST.
+			/// Used to speed up FindCommonParent().
+			/// </summary>
 			internal int level;
 			internal AstNode nextNode;
 			

ICSharpCode.Decompiler/Tests/TestCases/Pretty/Async.cs

@@ -166,5 +166,33 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 				Console.WriteLine("A", 1, num);
 			}
 		}
+
+		public async Task AwaitInCatch(Task<int> task1, Task<int> task2)
+		{
+			try {
+				Console.WriteLine("Start try");
+				await task1;
+				Console.WriteLine("End try");
+			} catch (Exception) {
+				Console.WriteLine("Start catch");
+				await task2;
+				Console.WriteLine("End catch");
+			}
+			Console.WriteLine("End Method");
+		}
+
+		public async Task AwaitInFinally(Task<int> task1, Task<int> task2)
+		{
+			try {
+				Console.WriteLine("Start try");
+				await task1;
+				Console.WriteLine("End try");
+			} finally {
+				Console.WriteLine("Start finally");
+				await task2;
+				Console.WriteLine("End finally");
+			}
+			Console.WriteLine("End Method");
+		}
 	}
 }

ILSpy/TreeNodes/AssemblyTreeNode.cs

@@ -97,15 +97,17 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 				if (tooltip == null) {
 					tooltip = new TextBlock();
+					if (assembly.AssemblyDefinition != null) {
 						tooltip.Inlines.Add(new Bold(new Run("Name: ")));
 						tooltip.Inlines.Add(new Run(assembly.AssemblyDefinition.FullName));
 						tooltip.Inlines.Add(new LineBreak());
+					}
 					tooltip.Inlines.Add(new Bold(new Run("Location: ")));
 					tooltip.Inlines.Add(new Run(assembly.FileName));
 					tooltip.Inlines.Add(new LineBreak());
 					tooltip.Inlines.Add(new Bold(new Run("Architecture: ")));
-					tooltip.Inlines.Add(new Run(CSharpLanguage.GetPlatformDisplayName(assembly.AssemblyDefinition.MainModule)));
-					string runtimeName = CSharpLanguage.GetRuntimeDisplayName(assembly.AssemblyDefinition.MainModule);
+					tooltip.Inlines.Add(new Run(CSharpLanguage.GetPlatformDisplayName(assembly.ModuleDefinition)));
+					string runtimeName = CSharpLanguage.GetRuntimeDisplayName(assembly.ModuleDefinition);
 					if (runtimeName != null) {
 						tooltip.Inlines.Add(new LineBreak());
 						tooltip.Inlines.Add(new Bold(new Run("Runtime: ")));