Merge pull request #15887 from owncloud/issue-15885-empty-getenv-path

Can't use function return value in write context

settings/admin.php

@@ -120,7 +120,8 @@ $template->assign('databaseOverload', $databaseOverload);
 $template->assign('cronErrors', $appConfig->getValue('core', 'cronErrors'));
 
 // warn if php is not setup properly to get system variables with getenv
-$template->assign('getenvServerNotWorking', empty(getenv('PATH')));
+$path = getenv('PATH');
+$template->assign('getenvServerNotWorking', empty($path));
 
 // warn if Windows is used
 $template->assign('WindowsWarning', OC_Util::runningOnWindows());