config: Don't accept null values as identifiers
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@ -277,6 +277,9 @@ namespace SparkleLib {
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public bool IdentifierExists (string identifier)
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{
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if (identifier == null)
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throw new ArgumentNullException ();
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foreach (XmlNode node_folder in SelectNodes ("/sparkleshare/folder")) {
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XmlElement folder_id = node_folder ["identifier"];
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