Fix issue 1346

[samtstern]

Description

Fixes #1346

Scenarios Tested

exports.rtdbReaction = functions.database.ref('info/test').onWrite(async (change, ctx) => {
    console.log('========== RTDB FUNCTION ==========');
    console.log(`Change: ${JSON.stringify(change)}`);
    return true;
});

$ http PUT http://localhost:9000/info/test.json?ns=fir-dumpster "Authorization:Bearer owner" sam=stern3

I observed no errors. I also tried writing the same function but have it throw an error and everything went as expected.

Sample Commands

N/A

[coveralls]

Coverage increased (+0.009%) to 62.304% when pulling 61488ab on ss-fix-1346 into 65bb69a on master.

[bkendall]

Seems like a reasonable fix to me... :)

[bkendall]

Not required, but, couldn't this be written:

try {
  await main();
} catch (err) {
  new EmulatorLog...
  process.exit(1);
}
// I don't know if you'd _really_ need this, but probably wouldn't hurt:
process.exit(0);

[samtstern]

Nah because we can't have top-level await :-(