Fixes.

Author: anderson-joyle

src/libraries/Microsoft.PowerFx.Core/Texl/Builtins/Filter.cs

@@ -145,7 +145,7 @@ public override bool IsServerDelegatable(CallNode callNode, TexlBinding binding)
             Contracts.AssertValue(callNode);
             Contracts.AssertValue(binding);
 
-            if (!CheckArgsCount(callNode, binding))
+            if (!CheckArgsCount(callNode, binding, DocumentErrorSeverity.Moderate))
             {
                 return false;
             }

src/tests/Microsoft.PowerFx.Core.Tests.Shared/AssociatedDataSourcesTests/TestDelegationValidation.cs

@@ -81,7 +81,7 @@ public void TestDelegableExpressions_ColumnNamesAsLiteralStrings(string expressi
 
         [Theory]
         [InlineData("UDF1()", "UDF1():Accounts = Accounts;", true)]
-        [InlineData("Filter(UDF1(), \"name\" <> \"\")", "UDF1():Accounts = Accounts;", false)]
+        [InlineData("Filter(UDF1(), \"name\" <> \"\")", "UDF1():Accounts = Accounts;", true)]
         public void TestDelegableExpressions_UserDfeinedFunction(string expression, string script, bool isDelegable)
         {
             TestDelegableExpressions(Features.PowerFxV1, expression, isDelegable, script);