Add err.sh for invalid getStaticPaths return value

[ijjk]

This adds an err.sh link for an invalid return value from getStaticPaths to better explain the error and how to correct it

[ijjk]

Stats from current PR

Default Server Mode

General Overall increase ⚠️

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
buildDuration	9.6s	9.8s	⚠️ +183ms
nodeModulesSize	54.5 MB	54.5 MB	⚠️ +188 B

Client Bundles (main, webpack, commons)

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
main-HASH.js gzip	5.05 kB	5.05 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..9ee3.js gzip	12.2 kB	12.2 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	57.2 kB	57.2 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
main-HASH.module.js gzip	4.14 kB	4.14 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	9.2 kB	9.2 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	53.2 kB	53.2 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
polyfills-HASH.js gzip	20.3 kB	20.3 kB	✓
Overall change	20.3 kB	20.3 kB	✓

Client Pages

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
_app.js gzip	1.06 kB	1.06 kB	✓
_error.js gzip	2.98 kB	2.98 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	1.9 kB	1.9 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.38 kB	7.38 kB	✓

Client Pages Modern

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
_app.module.js gzip	577 B	577 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	1.48 kB	1.48 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.26 kB	5.26 kB	✓

Client Build Manifests

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	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	ijjk/next.js add/staticpaths-errsh	Change
index.html gzip	925 B	925 B	✓
link.html gzip	934 B	934 B	✓
withRouter.html gzip	923 B	923 B	✓
Overall change	2.78 kB	2.78 kB	✓

---

Serverless Mode (Increase detected ⚠️)

General Overall increase ⚠️

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
buildDuration	10.3s	10.4s	⚠️ +56ms
nodeModulesSize	54.5 MB	54.5 MB	⚠️ +188 B

Client Bundles (main, webpack, commons)

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
main-HASH.js gzip	5.05 kB	5.05 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..9ee3.js gzip	12.2 kB	12.2 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	57.2 kB	57.2 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
main-HASH.module.js gzip	4.14 kB	4.14 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	9.2 kB	9.2 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	53.2 kB	53.2 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
polyfills-HASH.js gzip	20.3 kB	20.3 kB	✓
Overall change	20.3 kB	20.3 kB	✓

Client Pages

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
_app.js gzip	1.06 kB	1.06 kB	✓
_error.js gzip	2.98 kB	2.98 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	1.9 kB	1.9 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.38 kB	7.38 kB	✓

Client Pages Modern

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
_app.module.js gzip	577 B	577 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	1.48 kB	1.48 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.26 kB	5.26 kB	✓

Client Build Manifests

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Serverless bundles Overall increase ⚠️

	zeit/next.js canary	ijjk/next.js add/staticpaths-errsh	Change
_error.js gzip	290 kB	290 kB	-255 B
404.html gzip	1.33 kB	1.33 kB	✓
hooks.html gzip	964 B	964 B	✓
index.js gzip	290 kB	290 kB	⚠️ +403 B
link.js gzip	297 kB	297 kB	⚠️ +176 B
routerDirect.js gzip	296 kB	298 kB	⚠️ +1.64 kB
withRouter.js gzip	298 kB	298 kB	-30 B
Overall change	1.47 MB	1.47 MB	⚠️ +1.94 kB

Commit: a6a6724