Merge branch 'develop' of git.unl.edu:iim/PlanetRed into develop

plugins/cas_auth_unl/migration.php

@@ -60,7 +60,11 @@ foreach ($users as $source_user) {
             continue;
         }
         
-        $target_user = get_user($user_guid);
+        if (!$target_guid) {
+            continue;
+        }
+        
+        $target_user = get_user($target_guid);
     }
 
     foreach ($icon_sizes as $size) {