I solved the problem myself: Instead of using...
if($appliances != null){...}
I simply checked if a record in the repository is empty:
foreach($appliances as $appliance)
{
\TYPO3\CMS\Extbase\Utility\DebuggerUtility::var_dump(!empty($appliance));
if(!empty($appliance)){
if($appliance->getKundeuid() == $kunde->getUid())
{
$name = $appliance->getIpv4intern();
$address = $appliance->getIpv4extern();
$file = '/etc/icinga2/conf.d/hosts/'.$kunde->getName().'/Appliance_'.
$appliance->getIpv4intern().'_'.$kunde->getKundennummer() . '.conf';
$code_a = 'object Host "';
$code_b = '" {
import "generic-host"
address = "';
$code_c = '"
vars.notification["mail"] = {
groups = [ "icingaadmins" ]
}
}';
$fp = fopen("{$file}", 'wb');
fwrite($fp, $code_a . $name . $code_b . $address . $code_c);
fclose($fp);
}
}
}
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