Merge branch 'Preorder/fix-export' into 'master'

fixed export warnings/errors and when no campaign is selected for admins

See merge request fronk/thetool!1945

Layout/default/Preorder/export.csv.php

@@ -75,8 +75,8 @@ while($data = mysqli_fetch_object($res)):
 
     if($data->attributes) {
         $attribs = json_decode($data->attributes, true);
-        if($attribs['bep_specified']) $bep = true;
-        if($attribs['inhouse_cabling_supplied']) $inhouse = true;
+        if(isset($attribs['bep_specified']) && $attribs['bep_specified']) $bep = true;
+        if(isset($attribs['inhouse_cabling_supplied']) && $attribs['inhouse_cabling_supplied']) $inhouse = true;
     }
 
     $addon_property = 0;