Image TV Widget with no value?

//$tv_image is the TV that contains the Image Widget.
// has $tv_image been defined? If not, default to contentImage.
if( !$tv_image ) { $tv_image = "contentImage"; }

// fetch the src for the image to be used in the content.
$tv = $modx->getTemplateVar($tv_image);
$src = $tv['value'];

// if there is an image selected, find and return the output of the TV.
if ($src) {

  // fetch the document's current id.
  $currentid = $modx->documentObject['id'];

  // fetch the TV output and store it in $output.
  $value = $modx->getTemplateVarOutput($tv_image, $currentid);
  $output = $value[$tv_image];

  // return
  return $output;

}

// *********************************************
// SNIPPET:            TV
// Version:            1.0
// By:                 Kunal Kapoor
// Slight mods by:     Brett at The Man Can!
// *********************************************
//
// USAGE:
// The image widget and the HTML Generic Tag
// widgets return output even if the TV value
// is empty. Use this snippet to call a TV
// instead of calling the TV directly, in order
// to avoid having empty DIVs and IMG tags.
//
// DETAILS:
// http://modxcms.com/forums/index.php/topic,2940.0.html
//
// OPTIONS:
// name        The name of the TV that you're calling.
//
// EXAMPLE:
// Call        [!TV? &name=`colR` !]
// instead of  [*colR*]
//
// *********************************************

// Do not modify below.

// $name is the TV that contains the Widget.
// Has $name been defined? If not, return nothing.
if( !$name ) { return ''; }

// fetch the src for the TV to be used in the content.
$tv_source = $modx->getTemplateVar($name);
$src = $tv_source['value'];

// if there is an image selected, find and return the output of the TV.
if ($src) {

  // fetch the document's current id.
  $currentid = $modx->documentObject['id'];

  // fetch the TV output and store it in $output.
  $value = $modx->getTemplateVarOutput($name, $currentid);
  $output = $value[$name];

  // return
  return $output;

}