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MDL-24666 sync_users.php can throw db exception on sites upgraded fro…
…m 1.x From 2.0 on we lowercase all the settings related to LDAP attributes to cope with differences in LDAP servers when returning attribute names as array indices (some lowercase them, some leave them as specified in the query, some normalize them, etc.). But we only lowercase them when saving the settings page. So on sites that have been migrated from 1.x, it may happen that we still have mixed-case attribute names. And this is fatal for the user_attribute setting, as we might not detect it in the returned array from LDAP and it will be empty (and the db layer throws and exception). So we just make sure the attribute name is lowercased (and trimmed, in case it's got some white space around it).
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