src/main/java/org/apache/commons/net/nntp/Threader.java [180:195]:
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            Threadable threadable = c.threadable;

            // No threadable? If so, it is a dummy node in the root set.
            // Only root set members may be dummies, and they always have at least 2 kids
            // Take the first kid as representative of the subject
            if (threadable == null) {
                threadable = c.child.threadable;
            }

            final String subj = threadable.simplifiedSubject();

            if (subj == null || subj.isEmpty()) {
                continue;
            }

            final NntpThreadContainer old = subjectTable.get(subj);
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src/main/java/org/apache/commons/net/nntp/Threader.java [222:236]:
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            Threadable threadable = c.threadable;

            // is it a dummy node?
            if (threadable == null) {
                threadable = c.child.threadable;
            }

            final String subj = threadable.simplifiedSubject();

            // Don't thread together all subjectless messages
            if (subj == null || subj.isEmpty()) {
                continue;
            }

            final NntpThreadContainer old = subjectTable.get(subj);
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