Added error handling code so that procedurre set could be imported.

PROMS/VEPROMS User Interface/dlgExportImport.cs

@@ -422,6 +422,8 @@ namespace VEPROMS
 		{
 			Content c = Content.Get(pi.MyContent.ContentID);
 			XmlDocument xd = new XmlDocument();
+			// If the config field is empty, add an empty xml node.
+			if (c.Config == "") c.Config = "<Config/>";
 			xd.LoadXml(c.Config);
 			XmlNode xn = xd.SelectSingleNode("Config/Procedure/@SectionStart");
 			if (xn != null)