Activate ILSpy when breakpoint is hit

Debugger/ILSpy.Debugger/Services/Debugger/WindowsDebugger.cs

@@ -789,6 +789,8 @@ namespace ICSharpCode.ILSpy.Debugger.Services
 		{
 			if (debuggedProcess != null &&  debuggedProcess.SelectedThread != null) {
 
+				MainWindow.Instance.Activate();
+
 				// use most recent stack frame because we don't have the symbols
 				var frame = debuggedProcess.SelectedThread.MostRecentStackFrame;
 				
@@ -831,6 +833,8 @@ namespace ICSharpCode.ILSpy.Debugger.Services
 				TypeDefinition nestedTypeDef = null;
 				
 				foreach (var assembly in DebugInformation.LoadedAssemblies) {
+					if (null == assembly)
+						continue;
 					if ((assembly.FullName.StartsWith("System") || assembly.FullName.StartsWith("Microsoft") || assembly.FullName.StartsWith("mscorlib")) &&
 					    !assembly.Name.Version.ToString().StartsWith(debuggeeVersion))
 						continue;