<macro name="substitute-title"> for unsigned articles

Added <macro name="substitute-title"> to cope with unsigned articles and reviews, where the name of the newspaper or periodical (=container-title) needs to stand in place of the author (see CMoS 14.207 and 14.217). See discussion at https://forums.zotero.org/discussion/37961/choose-element-inside-substitute/
did you test this? I'd expect this to print both title and container title for journal articles etc.? 
I think the line needs to go as line 115 and line 127