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...which violates the ctor's preconditions, so is UB. Also, the "XML Help Document Type Definition" appendix of <http://documentation.openoffice.org/online_help/OOo2HelpAuthoring.pdf> states that "branch" and "id" attributes are #REQUIRED for the "bookmark" element. (There's probably further cases in the surrounding code where a std::string is created from a potentially null argument, which would benefit from similar fixes.) Change-Id: I414576d13de784de1290951bcdd5e3ecb51f9cb8 Reviewed-on: https://gerrit.libreoffice.org/55735 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Stephan Bergmann <sbergman@redhat.com>