fix(language-service): tolerate errors in decorators

[chuckjaz]

Fixes #14631

What kind of change does this PR introduce? (check one with "x")

[x] Bugfix

What is the current behavior? (You can also link to an open issue here)

Metadata errors caused the language service to produce strange cascading errors causing problems such as reported here: angular/vscode-ng-language-service#10

What is the new behavior?

Metadata errors are reported and ignored.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[x] No

[alexeagle]

this seems to be unused?

[alexeagle]

could it be filter() instead? where do the undefined values go?

[chuckjaz]

No as that would change the argument order. Imagine the call a(1, () => {}, 2), I want the transformed into a(1, undefined, 2) not a(1,2).

[alexeagle]

opt: all caps?

[alexeagle]

again

[chuckjaz]

see above

[alexeagle]

should there be a test for what happens with a Component with errors and verboseInvalidExpression is false?

[chuckjaz]

Not in this case. There are tests elsewhere that test that. The only time we need to handle more than one error is the case where there is error reporter and verboseInvalidExpressions is true. Testing this with verboseInvalidExpression as false would simplify the expression to a single error node which is what the other tests are already testing.

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