Fixed SD2-1479 - Null exception when running a Python project with the debugger;

Fixed the buttons "Continue" and "Terminate" in the exception dialog

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3676 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Service/DebugeeExceptionForm.cs

@@ -53,8 +53,6 @@ namespace ICSharpCode.SharpDevelop.Services
 {
 	internal sealed partial class DebugeeExceptionForm
 	{
-		private Result result = Result.Break; // Default
-		
 		private DebugeeExceptionForm()
 		{
 			InitializeComponent();

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Service/DebuggerEventForm.cs

@@ -48,7 +48,7 @@ namespace ICSharpCode.SharpDevelop.Services
 	{
 		public enum Result {Break, Continue, Terminate};
 		
-		private Result result = Result.Break; // Default
+		protected Result result = Result.Break; // Default
 		
 		protected DebuggerEventForm()
 		{

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Expressions/Expression.cs

@@ -64,8 +64,11 @@ namespace Debugger.Expressions
 		{
 			if (context.SelectedStackFrame != null) {
 				return Evaluate(context.SelectedStackFrame);
-			} else {
+			} else if (context.SelectedThread.MostRecentStackFrame != null ) {
 				return Evaluate(context.SelectedThread.MostRecentStackFrame);
+			} else {
+				// This can happen when needed 'dll' is missing.  This causes an exception dialog to be shown even before the applicaiton starts
+				throw new GetValueException("Can not evaluate because the process has no managed stack frames");
 			}
 		}