I was testing Simple Portal (development) addon and when uninstalling it I get this error:
The error complains this part of SiteCombiner.class.php:
	private function _addFile($options)
	{
		if (isset($options['dir']))
		{
			$filename = $options['dir'] . $options['basename'];
			$this->_combine_files[$options['basename']] = array(
				'file' => $filename,
				'basename' => $options['basename'],
				'url' => $options['url'],
				'filemtime' => filemtime($filename),
				'minimized' => (bool) strpos($options['basename'], '.min.js') !== false || strpos($options['basename'], '.min.css') !== false,
			);
			$this->_stales[] = $this->_combine_files[$options['basename']]['filemtime'];
			return true;
		}
		return false;
	}
I read elsewhere where it is suggested to run a check whether $filename exists before continuing with filemtime, otherwise, similar error as above may occur. So I was wondering whether we should add a condition to it to prevent such an error from reoccuring? Is the following way the right way to fix it?
	private function _addFile($options)
	{
		if (isset($options['dir']))
		{
			$filename = $options['dir'] . $options['basename'];
			if (file_exists($filename)) {
				$this->_combine_files[$options['basename']] = array(
					'file' => $filename,
					'basename' => $options['basename'],
					'url' => $options['url'],
					'filemtime' => filemtime($filename),
					'minimized' => (bool) strpos($options['basename'], '.min.js') !== false || strpos($options['basename'], '.min.css') !== false,
				);
				$this->_stales[] = $this->_combine_files[$options['basename']]['filemtime'];
				return true;
			}
		}
		return false;
	}