No Null Values? Plugin: Minutes, Agendas, Newsletters – Eliminate Null Values

There is a lot of code to this plug in and the developer is not available to assist.
Is there a way.. in the code below, to not echo null values?
Here is what is happening:

<td><?php
   if ($month_has[$docType]) {
    	$documents_listed_count++;
        foreach ($this->documents[$docType][$year][$month] as $day=>$filename) {
             echo $this->interpret($td_content, $filename, $docType, $year, $month, $day); echo '<br>';

                  }
    } else {
          echo '&nbsp;';
    }
   ?>
</td>