fix(material/sort): fix undefined object access

[chunghha]

This commit fixes hard crash that results from accessing undefined object's property. #22210

[chunghha]

@crisbeto and @andrewseguin please review.

[crisbeto]

LGTM

[swftvsn]

Awesome!

Thank you for the work!

[aailyin]

@andrewseguin Could you move forward this PR, please? It would be awesome to have this fix in the nearest release..

[chunghha]

@andrewseguin / @crisbeto could we get this fix merged to resolve the production bug with v11.2.x if a release will happen today for the version? Othewise, I'd like to be communicated about when to be merged if this fix is going to stay still in the queue today.

[andrewseguin]

I was able to get this merged in but unfortunately it won't be backported to the 11.2.x branch. The fix will be present in the next 12.0.x patch released today

[chunghha]

Thanks, @andrewseguin

However, I can upgrade my production apps to Angular v12 about 6 months later. Is there any particular reason not to patch the error in the 11.2.x? I mean it would be so nice to get it backported to the branch. If you want me to check out the 11.2.x branch then I will do a PR with the branch. Please let me know.

[chunghha]

I just saw the changelog of 11.2.13 in the branch. Thanks a lot, @andrewseguin

[andrewseguin]

You got it @chunghha, hope that helps y'all out!

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