Catch broken confirmConsent configuration

[zero-24]

Pull Request for Issue raised here: https://forum.joomla.de/thread/8188-dsgvo-anfrageformular-bringt-fehlermeldung/ (german)

Summary of Changes

Make sure there is an article object. When not forward to an 404 error as the article ID does not exists.

Testing Instructions

configure confirm consent
show it in the frontend
remove the article
try to show it in the frontend again

Expected result

404

Actual result

Notice: Trying to get property 'id' of non-object in /plugins/content/confirmconsent/fields/consentbox.php on line 252
Notice: Trying to get property 'language' of non-object in /plugins/content/confirmconsent/fields/consentbox.php on line 255
Notice: Trying to get property 'id' of non-object in /plugins/content/confirmconsent/fields/consentbox.php on line 269
Notice: Trying to get property 'catid' of non-object in /plugins/content/confirmconsent/fields/consentbox.php on line 269
Notice: Trying to get property 'language' of non-object in /plugins/content/confirmconsent/fields/consentbox.php on line 270

Documentation Changes Required

none

[ChristineWk]

Confirm "Actual Result". After Patch: error 404 of previous removed article.

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[ChristineWk]

I have tested this item ✅ successfully on 6c9605a

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[zero-24]

Thanks @ChristineWk for your tests 👍

[viocassel]

I have tested this item ✅ successfully on 6c9605a

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[Quy]

RTC

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[ghost]

Status "Ready To Commit".

[zero-24]

Thanks 👍

[HLeithner]

Thank you very much for this failsafe.