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notmuch-index-message: Avoid crashing when a message has no references.
It's obviously an innocent-enough message, and the right thing is so easy to do.
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@ -215,6 +215,9 @@ add_terms_references (Xapian::Document doc,
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refs = g_mime_object_get_header (GMIME_OBJECT (message), "references");
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if (refs == NULL)
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return;
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while (*refs) {
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while (*refs && isspace (*refs))
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refs++;
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