Minor changes in VS Operations

Author: Priyan Vaithilingam

src/VisualStudio/CodeTalk/Talkpoints/ExpressionTalkpoint.cs

@@ -18,10 +18,10 @@ public ExpressionTalkpoint(string filePath, CursorPos position, bool doesContinu
         public override void Execute()
         {
             if (string.IsNullOrEmpty(expression)) { return; }
-            var exp = TalkCodePackage.vsOperations.RunExpressionInDebugger(expression);
-            if (exp.IsValidValue)
+            var expResult = TalkCodePackage.vsOperations.RunExpressionInDebugger(expression);
+            if (!string.IsNullOrEmpty(expResult))
             {
-                TextToSpeech.SpeakText(exp.Value);
+                TextToSpeech.SpeakText(expResult);
             }
         }
     }

src/VisualStudio/CodeTalk/VSOperations.cs

@@ -122,9 +122,14 @@ public void BreakHandler(dbgEventReason reason, ref dbgExecutionAction execActio
 
         }
 
-        public EnvDTE.Expression RunExpressionInDebugger(string expression)
+        public string RunExpressionInDebugger(string expression)
         {
-            return dte.Debugger.GetExpression(expression);
+			var exprResult = dte.Debugger.GetExpression(expression);
+			if (exprResult.IsValidValue)
+			{
+				return exprResult.Value;
+			}
+			return string.Empty;
         }
 
         Talkpoint MatchTalkPoint(Breakpoint breakpoint)