We prevent getRecordAsJson to be called twice when rendering element.
Fix annotations of for return values of JSON elements

Resolves: #74331
Change-Id: Ib4826ebeee33f91c18db230d1aba2ffe39070ea1
Reviewed-on: https://review.typo3.org/47112


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>