Manipulate the no_results tag

gistfile1.php

// Add this to your module tag

if($no_results_prefix = $this->EE->TMPL->fetch_param('no_results_prefix'))
{
	if(preg_match('/\\'.LD.'if '.$no_results_prefix.'no_results\\'.RD.'.*\\'.LD.'\\/if\\'.RD.'/us', $this->EE->TMPL->tagdata, $matches))
	{
		$this->EE->TMPL->no_results = $this->EE->TMPL->parse_variables_row($matches[0], array(
			$no_results_prefix.'no_results' => 1
		));
	}
}

// Usage in EE template

{exp:parent:tag}
	
	{if no_results}
		<p>No Parent Results</p>
	{/if}
	
	{exp:child:tag no_results_prefix="nested_"}
	
		{if nested_no_results}
			<p>No Child Results</p>
		{/if}
		
	{/exp:child:tag}
	
{/exp:parent:tag}