fix(angularMajorCompatGuarantee): add check for range === null fixes #12644

[tkrugg]

• Is there any better way to handle this check with typescript?
• I didn't find any tests targeting specifically peer dependencies. Can you point me at it?
• is there any linter formatter I should ran?

Fixes #12644

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[tkrugg]

I've signed it

[googlebot]

CLAs look good, thanks!

[alan-agius4]

Kindly also fix the commit message as per guidelines https://github.com/angular/angular-cli/blob/master/CONTRIBUTING.md

fix(@schematics/update): add check for invalid ranges

Fixes #12644

[alan-agius4]

Can you please rebase?

[tkrugg]

rebased

[tkrugg]

@alan-agius4 any idea why some of the checks are failing?

[alan-agius4]

That is because this method return type should not be of type boolean but rather string.

[mgechev]

@tkrugg the build is still failing. Would you fix the typing errors?

[alan-agius4]

@tkrugg can you check the above comment?

Thank you.

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