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Print a somewhat more useful message when the -i option is omitted
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@ -79,6 +79,7 @@ class PackageMerger:
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""" Reads the contents.xml file from the indicated sourceDir,
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and updates the internal set of packages appropriately. """
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assert sourceDir != None, "No source directory was specified!"
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contentsFilename = Filename(sourceDir, 'contents.xml')
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doc = TiXmlDocument(contentsFilename.toOsSpecific())
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if not doc.LoadFile():
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