server/utils.php: parse_smime: Undef variable '$inner_headers'

[umgfoin]

l. 508 ff. function parse_smime($store, $message) refers variable $inner_headers, which is undefined.

mapi_setprops($message, [
                                PR_MESSAGE_CLASS => $props[PR_MESSAGE_CLASS],
                                PR_SENT_REPRESENTING_NAME => $props[PR_SENT_REPRESENTING_NAME],
                                PR_SENT_REPRESENTING_ENTRYID => $props[PR_SENT_REPRESENTING_ENTRYID],
                                PR_SENT_REPRESENTING_SEARCH_KEY => $props[PR_SENT_REPRESENTING_SEARCH_KEY],
                                PR_SENT_REPRESENTING_EMAIL_ADDRESS => $props[PR_SENT_REPRESENTING_EMAIL_ADDRESS] ?? '',
                                PR_SENT_REPRESENTING_SMTP_ADDRESS => $props[PR_SENT_REPRESENTING_SMTP_ADDRESS] ?? '',
                                PR_SENT_REPRESENTING_ADDRTYPE => $props[PR_SENT_REPRESENTING_ADDRTYPE] ?? 'SMTP',
                                PR_CLIENT_SUBMIT_TIME => $props[PR_CLIENT_SUBMIT_TIME] ?? time(),
                                PR_TRANSPORT_MESSAGE_HEADERS => ($props[PR_TRANSPORT_MESSAGE_HEADERS] ?? "") . $inner_headers,
                        ]);

Removing the variable, cures the obvious, but as there's another basic issue (#39) with smime-signed messages in g-web, a closer look might be worthy.