dhall to-directory-tree: Fix support for empty Maps
#827
| Job | Run time |
|---|---|
| 27m 57s | |
| 27m 57s | |
| 27m 57s | |
| 48m 31s | |
| 48m 31s | |
| 48m 31s | |
| 29m 56s | |
| 29m 56s | |
| 29m 56s | |
| 18m 32s | |
| 39m 9s | |
| 32m 2s | |
| 33m 52s | |
| 33m 52s | |
| 33m 52s | |
| 29m 36s | |
| 29m 36s | |
| 29m 36s | |
| 28m 48s | |
| 28m 48s | |
| 28m 48s | |
| 11h 25m 43s |