Playground doesn't show errors for bad input

[philrz]

At the time this issue is being opened, super is at commit eafe66d.

As shown in the attached video, right now the Playground does a good job of showing parse errors in the Result panel, which is helpful if the reader is hacking around trying different variations on a query. But if there's a syntax error with the input data, right now the Result panel remains empty. Meanwhile if the same example is run at the shell a prominent error is shown. We probably don't need to be as exhaustive as the shell with the error output, but having something in the Result panel just saying something like "Syntax error with input data" seems like it would be a big improvement.

Repro.mp4

[philrz]

I'm reminded that recently someone was recently faced with cryptic output in the Results panel and the root cause was determined to be an underlying panic. Maybe this is a stretch goal, but is there any chance we can catch/present those too? I'm not sure if showing the total panic output is appropriate here, but as long as we're looking into ways to catch other kinds of error output maybe we can give some thought to that one as well. If a user is hitting a panic it'd be nice for them to see something that inspires them to open an issue or come talk to us on community Slack.