Add empty list initalizers to help avoid NREs

DataTables.Queryable/DataTables.Queryable.csproj

@@ -41,6 +41,7 @@
     <Compile Include="DataTablesQueryProvider.cs" />
     <Compile Include="DataTablesRequest.cs" />
     <Compile Include="ExpressionExtensions.cs" />
+    <Compile Include="NoPropertyByNameException.cs" />
     <Compile Include="PagedList.cs" />
     <Compile Include="PredicateBuilder.cs" />
     <Compile Include="QueryableExtensions.cs" />

DataTables.Queryable/DataTablesAjaxPostModel.cs

@@ -16,6 +16,12 @@ namespace DataTables.Queryable
     /// </remarks>
     public class DataTablesAjaxPostModel
     {
+        public DataTablesAjaxPostModel()
+        {
+            Columns = new List<ColumnData>();
+            Order = new List<OrderData>();
+        }
+
         /// <summary>
         /// Draw counter. This is used by DataTables to ensure that the Ajax returns from 
         /// server-side processing requests are drawn in sequence by DataTables 

DataTables.Queryable/DataTablesRequest.cs

@@ -180,7 +180,7 @@ public DataTablesRequest(NameValueCollection query)
                     }
                     else
                     {
-                        throw new ArgumentException($"Could not find a property called \"{data}\" on type \"{type}\". Make sure you have specified correct value of \"columnDefs.data\" parameter in datatables options.");
+                        throw new NoPropertyByNameException($"Could not find a property called \"{data}\" on type \"{type}\". Make sure you have specified correct value of \"columnDefs.data\" parameter in datatables options.");
                     }
                 }
 
@@ -194,13 +194,13 @@ public DataTablesRequest(NameValueCollection query)
                     }
                     else
                     {
-                        throw new ArgumentException($"Could not find a property called \"{name}\" on type \"{type}\". Make sure you have specified correct value of \"columnDefs.name\" parameter in datatables options.");
+                        throw new NoPropertyByNameException($"Could not find a property called \"{name}\" on type \"{type}\". Make sure you have specified correct value of \"columnDefs.name\" parameter in datatables options.");
                     }
                 }
 
                 if (propertyName == null)
                 {
-                    throw new ArgumentException($"Unable to associate datatables column \"{colIndex}\" with model type \"{typeof(T)}\". There are no matching public property found. Make sure you specified valid identifiers for \"columnDefs.data\" and/or \"columnDefs.name\" parameters in datatables options for the column \"{colIndex}\".");
+                    throw new NoPropertyByNameException($"Unable to associate datatables column \"{colIndex}\" with model type \"{typeof(T)}\". There are no matching public property found. Make sure you specified valid identifiers for \"columnDefs.data\" and/or \"columnDefs.name\" parameters in datatables options for the column \"{colIndex}\".");
                 }
 
                 var column = new DataTablesColumn<T>()

DataTables.Queryable/NoPropertyByNameException.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace DataTables.Queryable
+{
+    public class NoPropertyByNameException : Exception
+    {
+        public NoPropertyByNameException(string message) : base(message) { }
+    }
+}