[BUG] Vague exception when you've got an invalid contenttypes.yml

[Maelstromeous]

By accident, I had an invalid config for contenttypes.yml.

However, the exception that was thrown was extremely vague, which basically gave me no information as to what I did wrong.

Twig_Error_Runtime in Template.php line 556:
Impossible to access an attribute ("all") on a null variable in "@bolt/exception/_request.twig" at line 46.

Used contenttype (notice the type: image is missing)

shields:
    name: Shields
    singular_name: Shield
    fields:
        title:
            type: text
        image:
            upload: shields

Details

• Relevant Bolt Version: 3.2.5
• Install type: Composer
• PHP version: 5.6
• Used web server: Apache

Reproduction

1. Create an invalid contenttype
2. Attempt to load a page
3. Observe exception

[bobdenotter]

On it!

[michaelborn]

I can confirm, this was a pain. Thanks for the fix @bobdenotter !