Fix warnings "Undefined variable" & "Undefined array key 1" #35
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E_WARNING: Undefined variable $ID/../wiki/lib/plugins/popupviewer/syntax/viewer.php(62) E_WARNING: Undefined array key 1/../wiki/lib/plugins/popupviewer/syntax/viewer.php(47)
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Multiple warnings in Dokuwiki logs:
E_WARNING: Undefined variable $ID/opt/www/wiki/lib/plugins/popupviewer/syntax/viewer.php(62)
E_WARNING: Undefined array key 1/opt/www/wiki/lib/plugins/popupviewer/syntax/viewer.php(47)