Dont throw an exception if a variable can't be found in a table, instead just return nil

Upsilon/BaseTypes/ScriptTable/ScriptTable.cs

@@ -27,7 +27,6 @@ namespace Upsilon.BaseTypes.ScriptTable
             {
                 return o;
             }
-            diagnostics.LogError($"Cannot find member '{s}' on Table", span);
             return new ScriptNull();
         }
 
@@ -48,7 +47,7 @@ namespace Upsilon.BaseTypes.ScriptTable
             {
                 return result;
             }
-            throw new Exception($"Can't find key '{index}' in table.");
+            return new ScriptNull();
         }
 
         public abstract IEnumerator<ScriptType> GetScriptEnumerator();