By: Greg Pfeil <greg@technomadic.org>
Accept empty string literals
The Fluent grammar gives
StringLiteral ::= "\"" quoted_char* "\""
— zero or more — but `stringLiteral` used `sisome`, demanding at least one
character. So `{""}` was rejected.
| Time to Start | Worker time | Duration | Time to finish | Idle | |
| Config | 2s | 8s | 8s | 11s | 2s |
| Eval | 9s | 17s | 17s | 26s | 0s |
| Build | 20s | 1m07s | 23s | 43s | 0s |
| Suite | 2s | 1m34s | 41s | 43s | 2s |