Communication error when using column "keywords" #201
Description
In a completely fresh typo3 installation 8.7.19 there comes a ajax-error in the media grid (only) if the column "keywords" is selected.
"Communication error
Oups! Something went wrong with the Ajax request... Investigate the problem in the Network Monitor."
"Core: Exception handler (WEB): Uncaught TYPO3 Exception: #1390391042: Missing property value for Grid Renderer Metadata | Exception thrown in file /www/htdocs/m0134860/typo3conf/ext/media/Classes/Grid/MetadataRenderer.php in line 32. Requested URL: http://typo3test.url.at/typo3/index.php?M=file_VidiSysFileM1&moduleToken=--AnonymizedToken--&id=1%3A%2F&order%5B0%5D%5Bcolumn%5D=0&order%5B0%5D%5Bdir%5D=asc&start=0&length=25&search%5Bvalue%5D=&search%5Bregex%5D=false&id=1%253A%252F&tx_vidi_file_vidisysfilem1%5Bcolumns%5D=__checkbox%2Cfileinfo%2Cmetadata.title%2Cmetadata.categories%2Cusage%2Cmetadata.keywords%2C__buttons&tx_vidi_file_vidisysfilem1%5Baction%5D=list&tx_vidi_file_vidisysfilem1%5Bcontroller%5D=Content&tx_vidi_file_vidisysfilem1%5Bformat%5D=json&_=1540320617870"
installed media 4.5.0, vidi 2.7.1, metadata 2.3.0 (filemetadata 8.7.19)