Fix compatibility with Symfony 4.2 and up. #3048
Merged
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This enables running scheduled shell commands again because Symfony 4.2 deprecated passing commands as a string to the Process component: https://symfony.com/blog/new-in-symfony-4-2-important-deprecations#deprecated-process-commands-as-strings
One also needs to catch all possible exceptions from the Process component, though. These exceptions are never displayed or sent to any of the logs and I've spent hours trying to debug why my scheduled tasks are failing.
Fix should be applied to 1.6 and 1.7 branches.