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6595_php_deprecated_warning_letsencrypt

Hannes requested to merge Hannes/isp-config-3-testing:6595_php_deprecated_warning_letsencrypt into develop

Fixes the #6595 (closed) (php_deprecated_warning_letsencrypt)

with

-               $acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh 2> /dev/null'));
+               $acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh 2> /dev/null') ?? '');

I could change it to cast string too if this is prefered

 -               $acme = explode("\n", shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh 2> /dev/null'));
+               $acme = explode("\n", (string) shell_exec('which acme.sh /usr/local/ispconfig/server/scripts/acme.sh /root/.acme.sh/acme.sh 2> /dev/null'));

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