Handle exceptions in ArrayValueReference.Value getter to be properly shown in watch view

(cherry picked from commit abcd933)

Author: nerzhulart

Mono.Debugging/Mono.Debugging.Evaluation/ArrayValueReference.cs

@@ -44,7 +44,11 @@ public ArrayValueReference (EvaluationContext ctx, object arr, int[] indices) :
 
 		public override object Value {
 			get {
-				return adaptor.GetElement (indices);
+				try {
+					return adaptor.GetElement (indices);
+				} catch (Exception e) {
+					throw new EvaluatorException (string.Format ("Failed to get array element: {0}", e.Message), e);
+				}
 			}
 			set {
 				adaptor.SetElement (indices, value);

Mono.Debugging/Mono.Debugging.Evaluation/ExpressionEvaluator.cs

@@ -208,6 +208,10 @@ protected EvaluatorException (SerializationInfo info, StreamingContext context)
 		public EvaluatorException (string msg, params object[] args): base (string.Format(msg, args))
 		{
 		}
+
+		public EvaluatorException (string message, Exception innerException) : base (message, innerException)
+		{
+		}
 	}
 
 	[Serializable]