Revert "Fix: Throw an error for empty array return in generateStaticParams with output:export"

[styfle]

Reverts #57053 per this comment: #57053 (comment)

Instead of erroring, we should warn (and only in dev mode). That can be added in a future PR.

Closes NEXT-2155

[ijjk]

Stats from current PR

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General

	vercel/next.js canary	vercel/next.js revert-57053-fix-empty-gsp-return	Change
buildDuration	13.9s	13.9s	N/A
buildDurationCached	7.7s	6.8s	N/A
nodeModulesSize	200 MB	200 MB	N/A
nextStartRea..uration (ms)	445ms	438ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js revert-57053-fix-empty-gsp-return	Change
193.HASH.js gzip	181 B	182 B	N/A
3f784ff6-HASH.js gzip	53.4 kB	53.4 kB	✓
433-HASH.js gzip	29 kB	29 kB	N/A
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main-HASH.js gzip	31.8 kB	31.8 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	N/A
Overall change	98.6 kB	98.6 kB	✓

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polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

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1afbb74e6ecf..834.css gzip	106 B	106 B	✓
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Client Build Manifests

	vercel/next.js canary	vercel/next.js revert-57053-fix-empty-gsp-return	Change
_buildManifest.js gzip	484 B	485 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js revert-57053-fix-empty-gsp-return	Change
index.html gzip	528 B	526 B	N/A
link.html gzip	540 B	539 B	N/A
withRouter.html gzip	524 B	522 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

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edge-ssr.js gzip	94 kB	94 kB	N/A
page.js gzip	149 kB	148 kB	N/A
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Middleware size

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middleware-b..fest.js gzip	625 B	626 B	N/A
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middleware.js gzip	37.5 kB	37.5 kB	N/A
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Next Runtimes

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app-page-exp...dev.js gzip	169 kB	169 kB	✓
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app-page-tur..prod.js gzip	96.3 kB	96.3 kB	✓
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app-route-ex..prod.js gzip	16.8 kB	16.8 kB	✓
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app-route.ru..prod.js gzip	16.4 kB	16.4 kB	✓
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pages-api.ru..prod.js gzip	9.39 kB	9.39 kB	✓
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pages.runtim..prod.js gzip	22 kB	22 kB	✓
server.runti..prod.js gzip	49.7 kB	49.7 kB	N/A
Overall change	894 kB	894 kB	✓

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Commit: 1abf239