Fix another "Parameter must be an array or an object that implements Countable" error.

Author: leofeyer

system/modules/core/drivers/DC_Table.php

@@ -3424,7 +3424,7 @@ protected function treeView()
 		$_buttons = ' ';
 
 		// Show paste button only if there are no root records specified
-		if (\Input::get('act') != 'select' && $GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['mode'] == 5 && $blnClipboard && ((!count($GLOBALS['TL_DCA'][$table]['list']['sorting']['root']) && $GLOBALS['TL_DCA'][$table]['list']['sorting']['root'] !== false) || $GLOBALS['TL_DCA'][$table]['list']['sorting']['rootPaste']))
+		if (\Input::get('act') != 'select' && $GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['mode'] == 5 && $blnClipboard && ((empty($GLOBALS['TL_DCA'][$table]['list']['sorting']['root']) && $GLOBALS['TL_DCA'][$table]['list']['sorting']['root'] !== false) || $GLOBALS['TL_DCA'][$table]['list']['sorting']['rootPaste']))
 		{
 			// Call paste_button_callback (&$dc, $row, $table, $cr, $childs, $previous, $next)
 			if (is_array($GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['paste_button_callback']))