At least one mapping is required, but the field is not marked required

Howdy,

While setting up this module, I noticed that I was not getting the extra form elements on my webform edit screen. I opened up your module code and noticed that _sfweb2lead_webform_check_settings() requires all variables to be not empty:

 if ( empty ($sfweb2lead_webform_oid) || empty ($sfweb2lead_webform_mapping_settings) || empty ($sfweb2lead_webform_url) ) {
    return FALSE;
  } 
  else {
    return TRUE;
  }

Just thought I'd bring it to your attention...

Thanks!