BUG 8888 "Ventana DATA de report table no termina de cargar..." SOLVED

- there was no validations for native & custom date files while data preview for report tables
- validations added and posibles empty strings now are mapped to NULL on db.

workflow/engine/templates/pmTables/data.js

@@ -92,6 +92,8 @@ Ext.onReady(function(){
     switch (tableDef.FIELDS[i].FLD_TYPE) {
       case 'DATE':
         columnRenderer = function (value) { 
+          if (!value) return;
+
           if (!value.dateFormat)
             return value;
           else