EntityStorageInterface::loadByProperties is assumed to always be non-empty-array when it can be empty #902
Description
Bug report
I just got an error in PHPUnit w/ PHPStan for assertEmpty on a loadByProperties call:
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Line docroot/modules/custom/mymodul/tests/src/Kernel/ApiInstallTest.php
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32 Call to method PHPUnit\Framework\Assert::assertEmpty() with
non-empty-array<Drupal\Core\Entity\EntityInterface> will always
evaluate to false.
🪪 method.impossibleType
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Code snippet that reproduces the problem
$this->assertEmpty($consumer_storage->loadByProperties(['client_id' => 'default_consumer']));