fix(core): check nxjson cli exists before looking for keys

[mandarini]

Current Behavior

nx migrate next

and

nx migrate --run-migrations

gets error:

 >  NX   Running migrations from 'migrations.json'


 >  NX   Failed to run rm-default-collection-npm-scope from nx. This workspace is NOT up to date!


 >  NX   Cannot convert undefined or null to object

Expected Behavior

Check nxJson.cli exists before checking keys.

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Oct 19, 2023 10:11am

[nx-cloud]

☁️ Nx Cloud Report

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=b9e671c11d77e2c47880f0cf60bde64c5d2aa449 --head=e5a5b58002792a784f14f11247833486f407f7eb --parallel=1
• nx affected --targets=lint,test,build --base=b9e671c11d77e2c47880f0cf60bde64c5d2aa449 --head=e5a5b58002792a784f14f11247833486f407f7eb --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=b9e671c11d77e2c47880f0cf60bde64c5d2aa449 --head=e5a5b58002792a784f14f11247833486f407f7eb
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=b9e671c11d77e2c47880f0cf60bde64c5d2aa449 --head=e5a5b58002792a784f14f11247833486f407f7eb

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[github-actions]

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