When tokenizeString was changed to absl::StrSplit, there was a behavior
change because tokenizeString on an empty string returned an empty
vector - which the derivation builder (and likely a bunch of other
stuff) was depending on. The canonical way of fixing this is by passing
absl::SkipEmpty() to the function - there may be other places we need to
fix this as well.
This commit also includes some opportunistic absl::StrFormats and
StrCats, because I was here anyway, but those have no semantic
difference.
Change-Id: Ibf9bb602284f793fa55728481f63b838fb7a41db
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1631
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
26a59482d2