Allow for Field Validators to handle None values, fixed issue 1183, thanks Joe Barnhart

applications/admin/views/shell/index.html

@@ -66,7 +66,7 @@
 <div id="wrapper">
   <textarea id="output" readonly="readonly">web2py Shell {{=request.env.web2py_version}}</textarea>
 
-  <form id="form" action="{{=URL(r=request,f='callback',args=app)}}" method="get">
+  <form id="form" action="{{=URL('callback',args=app)}}" method="get">
     <div id="shellwrapper">
       <div id="caret">&gt;&gt;&gt;</div>
       <div class="tooltip">
@@ -103,7 +103,7 @@ jQuery(document).ready(function(){
     if(s.length>1 && s.substr(s.length-1,1)=='\n' && s.substr(s.length-2,1)!=':' &&
     (s.indexOf(':\n ')<0 || s.substr(s.length-2,1)=='\n')) {
       t.val('');
-      jQuery.post("{{=URL(r=request,f='callback',args=app)}}",
+      jQuery.post("{{=URL('callback',args=app)}}",
       {statement:s},function(data){o.html(o.html()+data).attr('scrollTop',o.attr('scrollHeight'));});
     } else { };
     if(event.keyCode==RETURN){