refactor(multiple): add non-null assertions first and last #23958
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Angular's QueryList first and last can actually be
undefined
,although this is not reflected by their type
(this is a current bug in Angular: angular/angular#42563)
this commit adds non-null assertions to first and last references within the codebase
in preparation for solving the Angular bug without causing too many breaking changes
For more information see: angular/angular#43604