Fix missing "if present" for "else"#554

Merged

handrews merged 2 commits intojson-schema-org:masterfrom

handrews:if-fixup

Mar 14, 2018

Commits on Mar 2, 2018

Fix missing "if present" for "else"
handrews
committed

Commits on Mar 13, 2018

More thorough rewrite of "if"/"then"/"else"
handrews
committed