Fix array to string conversion on event search

[nickvergessen]

{
"reqId": "nieyd2kcbYk5PfY5JctS",
"level": 3,
"time": "2020-09-24T10:48:21+00:00",
"remoteAddr": "85.195.247.3",
"user": "…",
"app": "PHP",
"method": "GET",
"url": "/ocs/v2.php/search/providers/calendar/search?term=gal&from=…",
"message": "Array to string conversion at /var/www/html/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php#81",
"userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0",
"version": "20.0.0.7"
}

Values come from:

server/apps/dav/lib/Search/EventsSearchProvider.php

Lines 61 to 64 in 2a054e6

	privatestatic$searchParameters = [
	'ATTENDEE' => ['CN'],
	'ORGANIZER' => ['CN'],
	];

Go in here:

server/apps/dav/lib/Search/EventsSearchProvider.php

Line 113 in 2a054e6

self::$searchParameters,

And end up as a "Str" parameter instead of array:

server/apps/dav/lib/CalDAV/CalDavBackend.php

Lines 1780 to 1786 in 7d06027

	foreach ($searchParametersas$property => $parameter) {
	$parameterAnd = $calendarObjectIdQuery->expr()->andX();
	$parameterAnd->add($calendarObjectIdQuery->expr()->eq('cob.name', $calendarObjectIdQuery->createNamedParameter($property, IQueryBuilder::PARAM_STR)));
	$parameterAnd->add($calendarObjectIdQuery->expr()->eq('cob.parameter', $calendarObjectIdQuery->createNamedParameter($parameter, IQueryBuilder::PARAM_STR)));
	$searchOr->add($parameterAnd);
	}

[nickvergessen]

/backport to stable20

[faily-bot]

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