Event Register: tweak statusBounce on some error messages

[mlutfy]

Overview

When we encounter certain errors, the statusBounce (redirection) sometimes leads to pages where we will not see the error message.

• If the Event does not have a valid price set, we get bounced, and most likely to the front page, so if the site is using a CMS, we will not see the bounce reason.
• If the Event is not active, we also get bounced to the front page.

Before

Bounce to front page, no error message displayed (since we are not in CiviCRM anymore, when using a CMS).

After

We can see error messages.

Technical Details

statusBounce usage more in line with other usages on that form.

Comments

I'm sure some people will say that event/list is an obscure ugly feature no one knows about, but .. maybe we can improve that too :)

[civibot]

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[mlutfy]

Test fail:

api\v4\Entity\ConformanceTest.testConformance with data set "SubscriptionHistory"

[mlutfy]

jenkins, test this please