Steps to replicate the issue (include links if applicable):
- Create a page, change its content model to JSON.
- Change the contents to be invalid, for example {"a":"b}.
- Hit the preview button.
- Exception's thrown.
What happens?: A LogicException is thrown due to the JSON content handler emitting no text for invalid data.
/wiki/Data:Test?action=submit LogicException: This ParserOutput contains no text!
Backtrace:
from /var/www/wiki/includes/parser/ParserOutput.php(363)
#0 /var/www/wiki/includes/parser/ParserOutput.php(412): ParserOutput->getRawText()
#1 /var/www/wiki/includes/EditPage.php(4538): ParserOutput->getText()
#2 /var/www/wiki/includes/EditPage.php(4434): EditPage->doPreviewParse()
#3 /var/www/wiki/includes/EditPage.php(3143): EditPage->getPreviewText()
#4 /var/www/wiki/includes/EditPage.php(778): EditPage->showEditForm()
#5 /var/www/wiki/includes/actions/EditAction.php(73): EditPage->edit()
#6 /var/www/wiki/includes/actions/SubmitAction.php(38): EditAction->show()
#7 /var/www/wiki/includes/MediaWiki.php(542): SubmitAction->show()
#8 /var/www/wiki/includes/MediaWiki.php(322): MediaWiki->performAction()
#9 /var/www/wiki/includes/MediaWiki.php(904): MediaWiki->performRequest()
#10 /var/www/wiki/includes/MediaWiki.php(562): MediaWiki->main()
#11 /var/www/wiki/index.php(50): MediaWiki->run()
#12 /var/www/wiki/index.php(46): wfIndexMain()
#13 {main}What should have happened instead?: Refuse the preview and display the edit form along with a validation error again.
Software version (skip for WMF-hosted wikis like Wikipedia): 1.39.0