fix(webpack): add check if scripts exist or fallback to empty array

[miles170]

Current Behavior

When I use @nrwl/node:webpack as executor, the build fails because of undefined buildOptions.scripts.

Expected Behavior

The build can be built using the @nrwl/node:webpack executor.

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✅ Successfully ran 12 targets

• nx affected --target=e2e --base=4e5656c5506a890b68765f8cb772db143ac061ec --head=bfbd14deb599ac63153a9b0d369faf89df3433ad --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx affected --target=test --base=4e5656c5506a890b68765f8cb772db143ac061ec --head=bfbd14deb599ac63153a9b0d369faf89df3433ad --parallel=1
• nx affected --target=build --base=4e5656c5506a890b68765f8cb772db143ac061ec --head=bfbd14deb599ac63153a9b0d369faf89df3433ad --parallel=3
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=4e5656c5506a890b68765f8cb772db143ac061ec --head=bfbd14deb599ac63153a9b0d369faf89df3433ad --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn check-lock-files
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=4e5656c5506a890b68765f8cb772db143ac061ec --head=bfbd14deb599ac63153a9b0d369faf89df3433ad
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

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1 Ignored Deployment

Name	Status	Preview	Updated
nx-dev	⬜️ Ignored (Inspect)		Sep 20, 2022 at 4:27AM (UTC)

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