[BUG] Exception when showing metadata of a document

[thomaslow]

Description

Argument 1 passed to Kitodo\Dlf\Common\MetsDocument::getLogicalStructure() must be of the type string, array given, called in /var/www/html/kitodo-presentation/Classes/Controller/MetadataController.php on line 313

Probably related to #1339 and #1317.

Reproduction

Steps to reproduce the behaviour:

1. Select a document
2. Open page with metadata widget
3. Get Exception

Expected Behavior

Metadata is shown without exception.

Environment

• OS version: Linux Docker (docker.io/php7.4-apache)
• RDBMS version: docker.io/library/mariadb:10.11
• Apache Solr version: 9.6
• TYPO3 version: 11.5.39
• PHP version: 7.4

[sebastian-meyer]

This is related to #1308.

We urgently need to fix metadata handling (it should be arrays everywhere, because every field can be multi-valued) and make sure, that all semi-fixes like #1317, #1339 and #1344 are reverted.