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00941: authuser.php fails on line 82 if no auth methods are defined

Description: When no $AuthUser variables are defined, authuser.php gives an error about an array being undefined.

The patch is very simple:

44,47c44
<   if(defined($AuthUser))
< 		  foreach((array)$AuthUser as $k=>$v) $auth[$k] = (array)$v;
<   else
< 		  $auth=array();
---
>   foreach((array)$AuthUser as $k=>$v) $auth[$k] = (array)$v;

This is needed when pmwiki auth functionality is unused; yet authentication happens using a .htaccess file.