The URL wasn't loading when the database is used (interwiki cache works). "PHP Notice...

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This reverts r97806. It took me some time to find out, but r96475 accidentally backported the change from $row->iw_url to $row['iw_url'] (etc) to 1.18, which was fixed in r97789. That revision was merged to trunk, which shouldn't have been done either. I.e. until 1.18 it is an object, from 1.19 it is an array.