Arch Linux

Description:
Installing 1.7.3-3 results in service failing to start
Reintroducing the line
"PIDFile=/run/unbound.pid"
under [Service] fixes the problem

Additional info:
Version affected: 1.7.3-3
Files involved: /usr/lib/systemd/system/unbound.service

Steps to reproduce:
install 1.7.3-3 and attempt to start service

Result:
Aug 08 12:21:48 mcp systemd[1]: Started Unbound DNS Resolver.
-- Subject: Unit unbound.service has finished start-up
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit unbound.service has finished starting up.
--
-- The start-up result is RESULT.
Aug 08 12:21:48 mcp unbound[1713]: [1713:0] notice: init module 0: validator
Aug 08 12:21:48 mcp unbound[1713]: [1713:0] notice: init module 1: iterator
Aug 08 12:21:48 mcp unbound[1713]: [1713:0] info: start of service (unbound 1.7.3).
Aug 08 12:21:48 mcp unbound[1713]: [1713:0] info: service stopped (unbound 1.7.3).
Aug 08 12:21:48 mcp unbound[1713]: [1713:0] info: server stats for thread 0: 0 queries, 0 answers from cache, 0 recursions, 0 prefetch, 0 rejected by ip ratelimiting
Aug 08 12:21:48 mcp unbound[1713]: [1713:0] info: server stats for thread 0: requestlist max 0 avg 0 exceeded 0 jostled 0
Aug 08 12:21:49 mcp systemd[1]: unbound.service: Service RestartSec=100ms expired, scheduling restart.
Aug 08 12:21:49 mcp systemd[1]: unbound.service: Scheduled restart job, restart counter is at 5.
-- Subject: Automatic restarting of a unit has been scheduled
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Automatic restarting of the unit unbound.service has been scheduled, as the result for
-- the configured Restart= setting for the unit.
Aug 08 12:21:49 mcp systemd[1]: Stopped Unbound DNS Resolver.
-- Subject: Unit unbound.service has finished shutting down
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit unbound.service has finished shutting down.
Aug 08 12:21:49 mcp systemd[1]: unbound.service: Start request repeated too quickly.
Aug 08 12:21:49 mcp systemd[1]: unbound.service: Failed with result 'start-limit-hit'.
Aug 08 12:21:49 mcp systemd[1]: Failed to start Unbound DNS Resolver.
-- Subject: Unit unbound.service has failed
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit unbound.service has failed.

Fix:
Reintroducing the line "PIDFile=/run/unbound.pid" under [Service] in /usr/lib/systemd/system/unbound.service