Brian Sperlongano 3f70b878e2
nulling subclass when not present (#1132)
PR #1119 (adding support for `highway=motorway_junction`) missed a few cases where NULLIF functions were needed in order to suppress empty-string `subclass` tags from appearing in vector tiles, resulting in unnecessary  `subclass` entries on `transportation_name` objects where it was not needed, for example:
![image](https://user-images.githubusercontent.com/3254090/123889414-7a11c600-d923-11eb-938c-f278b9bf1ffa.png)

This PR adds the missing NULLIF function so that those empty tags are suppressed:
![image](https://user-images.githubusercontent.com/3254090/123889540-b6452680-d923-11eb-8f0b-5c8c03640059.png)
2021-06-30 07:06:22 +02:00
..
2020-11-24 12:27:06 +02:00
2021-01-08 15:44:11 +01:00