Summary of Changes

If you login in the administration with a user who not have the Execute Transition permission and enter to the articles view, a warning error show up:

Warning: Undefined array key "value" in ..\joomla-cms\administrator\components\com_content\src\View\Articles\HtmlView.php on line 190

Warning: Undefined array key "value" in ..\joomla-cms\administrator\components\com_content\src\View\Articles\HtmlView.php on line 192

Testing Instructions

• Go to the com_content options and Enable Workflow

• Create a user with the follow permissions and login with him, in the administration area:
  

• Go back to the articles view

Actual result BEFORE applying this Pull Request

A list of errors show up (one for each transition button the view render)

Expected result AFTER applying this Pull Request

• Not errors show up

Note: The change in the HtmlView.php file is for fix the previous explained error. But when that happen another related error show up:

Warning: Undefined array key "from_stage_id" in ..\joomla-cms\administrator\components\com_content\src\Helper\ContentHelper.php on line 73

This is expected to happen, because the tmpl/default.php file do not check also if the user can execute a transition. So a little adjust is made there too.

Note: Therefor, the Admin Featured Articles View have the same error. I will glad make the PR for that one after this one get reviewed.: