Alan 0c65664f03 fix(@angular-devkit/build-angular): error only when file is not found in non of the programs
At the moment, if a user provides multiple tsconfig, a file needs to be part of all compilations as otherwise it will fail.

This PR changes this behavour and as long as it's in one of the compilations it will not error out.

Fixes #13399
2019-01-23 10:12:22 -08:00
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