Fixes #4112: Prevent the upgrade to Rudder 2.8 from breaking due to an incompatible Technique/Promise
Merge pull request #169 from Kegeruneku/bug_4110/int/4110_restore_init_promises_on_2_8_non_accepted_upgrades

Fixes #4112: Prevent the upgrade to Rudder 2.8 from breaking due to an i...