Issue 498: Allow for and pass innerException (#499)

src/core/Elsa.Abstractions/Exceptions/WorkflowException.cs

@@ -4,8 +4,16 @@ namespace Elsa.Exceptions
 {
     public class WorkflowException : Exception
     {
+        public WorkflowException() : base()
+        {
+        }
+
         public WorkflowException(string message) : base(message)
         {
         }
+
+        public WorkflowException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
     }
-}
+}

src/core/Elsa.Core/Expressions/WorkflowExpressionEvaluator.cs

@@ -37,7 +37,7 @@ namespace Elsa.Expressions
                 string message = $"Error while evaluating {expression.Syntax} expression \"{expression.Expression}\". Message: {e.Message}";
 
                 logger.LogError(e, message);
-                throw new WorkflowException(message);
+                throw new WorkflowException(message, e);
             }
         }
     }