Fix: Remove warning

htdocs/install/fileconf.php

@@ -388,7 +388,7 @@ if (! empty($force_install_message))
 			name="db_pass"
 			value="<?php
 			$autofill=((! empty($dolibarr_main_db_pass))?$dolibarr_main_db_pass:$force_install_databasepass);
-			if ($dolibarr_main_prod) $autofill='';
+			if (! empty($dolibarr_main_prod)) $autofill='';
 			print dol_escape_htmltag($autofill);
 			?>"></td>
 		<td class="comment"><?php echo $langs->trans("AdminPassword"); ?></td>