Guard against invalid JSON

[trieloff]

Invalid JSON bodies just fail badly with an error 500:

stderr | 1cc70987 | abort: Unexpected input end in ~lib/assemblyscript-json/decoder.ts(156:5)

I'm not sure how to catch parse errors with assemblyscript-json yet.

[trieloff]

See near/assemblyscript-json#225

[davidnuescheler]

hmm... also, are there some that are sent by browsers, or is this just from testing?
considering this...

https://github.com/adobe/theblog/blob/master/scripts/martech.js#L164

i would be really surprised if actual browsers send something broken here.

[trieloff]

Me too, and so far the only occurrence is this one:

stdout | 41c8d0b1 | request received{"time":1622134614271,"host":"rum.hlx3.page","url":"https://rum.hlx3.page/.rum/1","user_agent":"lars is messing around","CLS":1.0,"LCP":1.0}
stderr | 1cc70987 | abort: Unexpected input end in ~lib/assemblyscript-json/decoder.ts(156:5)

The user agent tells the story.