Steps to reproduce the issue

When creating a JsonApi view using the MVCFactory an error is produced if the optional options are not completed with a contentType.

Expected result

No error should be raised.

Actual result

An error is raised and the processing stops.

System information (as much as possible)

The constructor code in JsonApiView (within the MVC Library) is:
if (\array_key_exists('contentType', $config)) {
$this->type = $config['contentType'];
}
if ($this->serializer === null) {
$this->serializer = new JoomlaSerializer($this->type);
}

Additional comments

It should be:
if (\array_key_exists('contentType', $config)) {
$this->type = $config['contentType'];
if ($this->serializer === null) {
$this->serializer = new JoomlaSerializer($this->type);
}
}

So that the serializer is only called if the contentType option has been supplied.