fix(release): skip changelog generation for projects without available version data

[thdk]

Other places in code also check if the project exists in the versionData object before accessing its properties.

Fixes #29211

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✅ Successfully ran 6 targets

• nx affected --targets=lint,test,build,e2e,e2e-ci --base=15060e3a4f727d730c78a93513fe6d429d642c9c --head=e29942b6297645a6dfbac7d77783e2914f37a64b --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx-cloud conformance:check
• nx-cloud record -- nx format:check --base=15060e3a4f727d730c78a93513fe6d429d642c9c --head=e29942b6297645a6dfbac7d77783e2914f37a64b
• nx-cloud record -- nx sync:check
• nx documentation --no-dte

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[JamesHenry]

Thanks @thdk!

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