When editing an existing post, errors in the slug do not appear but you get "can not save the changes now"

[callingmybluff]

Summary

So when you are making changes to an existing draft, mistakes in the "slug" prevent saving he changes, and the user get a vague message.

Steps to Reproduce

1. Make a draft, and set a slug to it.
2. Save the changes.
3. Change the "slug" to something invalid, like: "2018" (not allowed as it starts with a number).
4. Try saving the changes
5. You will get "Your changes could not be saved at this time" instead of the more specific: "Slug must start with a letter ... etc".

Additional info

• Postleaf version: 1.0
• Node version: 7.10.1
• Affected browsers: Chrome
• Operating system: Debian 8 (host) vs. Windows (Browser)

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[claviska]

Confirmed. It looks like we're not handling the validation error from the post model.

I'll leave this open until I can get to it, or feel free to submit a PR instead :)