Fix PqHandle

[enumag]

Several times now I have seen this error:

[ErrorException]                                                      
Warning: foreach() argument must be of type array|object, null given  

Exception trace:
  at /app/vendor/amphp/postgres/src/PqHandle.php:68
 Amp\Postgres\PqHandle::Amp\Postgres\{closure}() at /app/vendor/amphp/amp/lib/Loop/EventDriver.php:63
 Amp\Loop\EventDriver->Amp\Loop\{closure}() at n/a:n/a
 EventBase->loop() at /app/vendor/amphp/amp/lib/Loop/EventDriver.php:255
 Amp\Loop\EventDriver->dispatch() at /app/vendor/amphp/amp/lib/Loop/Driver.php:138
 Amp\Loop\Driver->tick() at /app/vendor/amphp/amp/lib/Loop/Driver.php:72
 Amp\Loop\Driver->run() at /app/vendor/amphp/amp/lib/Loop/EventDriver.php:206
 Amp\Loop\EventDriver->run() at /app/vendor/amphp/amp/lib/Loop.php:95
 Amp\Loop::run() at /app/src/Module/Core/Console/RunLoopCommand.php:77
 App\Module\Core\Console\RunLoopCommand->execute() at /app/vendor/symfony/console/Command/Command.php:299
 Symfony\Component\Console\Command\Command->run() at /app/vendor/symfony/console/Application.php:996
 Symfony\Component\Console\Application->doRunCommand() at /app/vendor/symfony/framework-bundle/Console/Application.php:96
 Symfony\Bundle\FrameworkBundle\Console\Application->doRunCommand() at /app/vendor/symfony/console/Application.php:295
 Symfony\Component\Console\Application->doRun() at /app/vendor/symfony/framework-bundle/Console/Application.php:82
 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at /app/vendor/symfony/console/Application.php:167
 Symfony\Component\Console\Application->run() at /app/bin/console:25

Sadly it's pretty much random so I have no idea what the circumstances are nor can I give you a way to reproduce it. It started to appear when I tried to upgrade to amphp/postgres v1.4.

[trowski]

Thanks, clearly that was an oversight. It only comes up if polling the connection fails, which I'm not sure how to simulate in a test, so that's why it was overlooked.