Fix: Object of class DateTime could not be converted to string

[umpirsky]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
License	MIT

When coupon has expiresAt date set, this error may occur:

Error: Object of class DateTime could not be converted to string

…//vendor/doctrine/dbal/lib/Doctrine/DBAL/
Connection.php (694)
…81352/vendor/doctrine/orm/lib/Doctrine/ORM/Query/Exec/
SingleSelectExecutor.php (50)
/vendor/doctrine/orm/lib/Doctrine/ORM/
Query.php (286)
…/vendor/doctrine/orm/lib/Doctrine/ORM/
AbstractQuery.php (794)
…/vendor/doctrine/orm/lib/Doctrine/ORM/
AbstractQuery.php (646)
…/vendor/doctrine/orm/lib/Doctrine/ORM/
AbstractQuery.php (674)
…or/sylius/sylius/src/Sylius/Bundle/CoreBundle/Doctrine/ORM/
OrderRepository.php (198)
…us/src/Sylius/Component/Core/Promotion/Checker/
PromotionEligibilityChecker.php (102)
…us/src/Sylius/Component/Core/Promotion/Checker/
PromotionEligibilityChecker.php (97)
…us/src/Sylius/Component/Core/Promotion/Checker/
PromotionEligibilityChecker.php (67)
…/sylius/src/Sylius/Component/Promotion/Checker/
PromotionEligibilityChecker.php (90)
...

This happens because we cast coupon to array in order repository.

[michalmarcinkowski]

👍

[pjedrzejewski]

Thank you Sasha!