<p>What do you mean by 'not null code'?</p>
<p>From <a href="https://www.freedesktop.org/software/systemd/man/systemd.service.html">https://www.freedesktop.org/software/systemd/man/systemd.service.html</a></p>
<pre><code>Restart:
[...] If set to on-failure, the service will be restarted when the process exits with a non-zero exit code, is terminated by a signal (including on core dump, but excluding the aforementioned four signals), when an operation (such as service reload) times out, and when the configured watchdog timeout is triggered.
[...] If set to on-abort, the service will be restarted only if the service process exits due to an uncaught signal not specified as a clean exit status. 
</code></pre>

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