Handle Potential Promise Rejection in Serverless

[Timer]

While I was combing through the serverless loader, I noticed we don't await the apiResolver like we do for server mode.

While this function is mostly self-contained, we should still await it in case it ever rejects.

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General Overall increase ⚠️

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
buildDuration	10.2s	9.7s	-569ms
nodeModulesSize	55.5 MB	55.5 MB	⚠️ +6 B

Page Load Tests Overall decrease ⚠️

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
/ failed reqs	0	0	✓
/ total time (seconds)	1.944	2.041	⚠️ +0.1
/ avg req/sec	1285.95	1224.89	-61.06
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.134	1.137	0
/error-in-render avg req/sec	2204.87	2198.77	-6.1

Client Bundles (main, webpack, commons)

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
main-HASH.js gzip	6.25 kB	6.25 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..f272.js gzip	10.3 kB	10.3 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	56.4 kB	56.4 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
main-HASH.module.js gzip	4.78 kB	4.78 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.84 kB	6.84 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	51.5 kB	51.5 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
polyfills-HASH.js gzip	26.3 kB	26.3 kB	✓
Overall change	26.3 kB	26.3 kB	✓

Client Pages

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_app.js gzip	1.24 kB	1.24 kB	✓
_error.js gzip	3.15 kB	3.15 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.06 kB	2.06 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.88 kB	7.88 kB	✓

Client Pages Modern

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_app.module.js gzip	594 B	594 B	✓
_error.module.js gzip	2.08 kB	2.08 kB	✓
hooks.module.js gzip	370 B	370 B	✓
index.module.js gzip	212 B	212 B	✓
link.module.js gzip	1.51 kB	1.51 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.3 kB	5.3 kB	✓

Client Build Manifests

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Rendered Page Sizes

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
index.html gzip	930 B	930 B	✓
link.html gzip	937 B	937 B	✓
withRouter.html gzip	924 B	924 B	✓
Overall change	2.79 kB	2.79 kB	✓

---

Serverless Mode

General Overall increase ⚠️

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
buildDuration	10.6s	9.5s	-1.1s
nodeModulesSize	55.5 MB	55.5 MB	⚠️ +6 B

Client Bundles (main, webpack, commons)

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
main-HASH.js gzip	6.25 kB	6.25 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..f272.js gzip	10.3 kB	10.3 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	56.4 kB	56.4 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
main-HASH.module.js gzip	4.78 kB	4.78 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.84 kB	6.84 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	51.5 kB	51.5 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
polyfills-HASH.js gzip	26.3 kB	26.3 kB	✓
Overall change	26.3 kB	26.3 kB	✓

Client Pages

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_app.js gzip	1.24 kB	1.24 kB	✓
_error.js gzip	3.15 kB	3.15 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	2.06 kB	2.06 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.88 kB	7.88 kB	✓

Client Pages Modern

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_app.module.js gzip	594 B	594 B	✓
_error.module.js gzip	2.08 kB	2.08 kB	✓
hooks.module.js gzip	370 B	370 B	✓
index.module.js gzip	212 B	212 B	✓
link.module.js gzip	1.51 kB	1.51 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.3 kB	5.3 kB	✓

Client Build Manifests

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Serverless bundles

	zeit/next.js canary	Timer/next.js hotfix/catch-unhandled-exception	Change
_error.js	557 kB	557 kB	✓
404.html	4.18 kB	4.18 kB	✓
hooks.html	3.81 kB	3.81 kB	✓
index.js	557 kB	557 kB	✓
link.js	594 kB	594 kB	✓
routerDirect.js	586 kB	586 kB	✓
withRouter.js	586 kB	586 kB	✓
Overall change	2.89 MB	2.89 MB	✓