Populate required field Message with n/a if it is empty

BASE/Test/Microsoft.ApplicationInsights.Test/Microsoft.ApplicationInsights.Tests/Extensibility/Implementation/ExceptionConverterTest.cs

@@ -185,6 +185,19 @@ public void DoesNotTrimShortExceptionMessages()
             Assert.AreEqual(5, expDetails.message.Length);
         }
 
+        [TestMethod]
+        [DataRow(null)]
+        [DataRow("")]
+        [DataRow(" ")]
+        public void ProvidesDefaultMessage(string message)
+        {
+            var exp = new Exception(string.Empty);
+
+            ExceptionDetails expDetails = ExceptionConverter.ConvertToExceptionDetails(exp, null);
+
+            Assert.AreEqual("n/a", expDetails.message);
+        }
+
         [MethodImplAttribute(MethodImplOptions.NoInlining)]
         private Exception CreateException(int numberOfStackpoints)
         {

BASE/src/Microsoft.ApplicationInsights/Extensibility/Implementation/External/ExceptionDetailsImplementation.cs

@@ -1,6 +1,7 @@
 namespace Microsoft.ApplicationInsights.Extensibility.Implementation.External
 {
     using System;
+    using Microsoft.ApplicationInsights.DataContracts;
 
     /// <summary>
     /// Additional implementation for ExceptionDetails.
@@ -21,7 +22,7 @@ internal static ExceptionDetails CreateWithoutStackInfo(Exception exception, Exc
             {
                 id = exception.GetHashCode(),
                 typeName = exception.GetType().FullName,
-                message = exception.Message,
+                message = Utils.PopulateRequiredStringValue(exception.Message, "message", typeof(ExceptionTelemetry).FullName),
             };
 
             if (parentExceptionDetails != null)

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 
 ## VNext
+- [Populate required field Message with "n/a" if it is empty](https://github.com/microsoft/ApplicationInsights-dotnet/issues/1066)
 
 ## Version 2.22.0
 - no changes since beta.