Missing tsconfig break update process

[filipesilva]

This issue impacts 9.0.0-rc.0 and happened while updating https://github.com/vmware/clarity.

Having a target that references a missing tsconfig file will prevent ng update from completing:

kamik@RED-X1C6 MINGW64 /d/sandbox/clarity (update-9)
$ ng update @angular/cli @angular/core --next --force
The installed Angular CLI version is older than the latest published version.
Installing a temporary version to perform the update.
Installing packages for tooling via npm.
C:\Users\kamik\AppData\Local\Temp\.ng-temp-packages-6VhtAc\ng -> C:\Users\kamik\AppData\Local\Temp\.ng-temp-packages-6VhtAc\node_modules\@angular\cli\bin\ng

> @angular/cli@9.0.0-rc.0 postinstall C:\Users\kamik\AppData\Local\Temp\.ng-temp-packages-6VhtAc\node_modules\@angular\cli
> node ./bin/postinstall/script.js

+ @angular/cli@9.0.0-rc.0
added 254 packages from 205 contributors in 18.965s
Installed packages for tooling via npm.
Using package manager: 'npm'
Collecting installed dependencies...
Found 109 dependencies.
Fetching dependency metadata from registry...
                  Package "@angular-builders/custom-webpack" has an incompatible peer dependency to "@angular-devkit/build-angular" (requires ">=0.801.0", would install "0.900.0-rc.0").
                  Package "ts-api-guardian" has an incompatible peer dependency to "typescript" (requires "~3.4.0", would install "3.6.4").
    Updating package.json with dependency @angular/cli @ "9.0.0-rc.0" (was "8.3.17")...
    Updating package.json with dependency @angular/core @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/compiler-cli @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/language-service @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular-devkit/build-angular @ "0.900.0-rc.0" (was "0.800.0")...
    Updating package.json with dependency @angular-devkit/build-ng-packagr @ "0.900.0-rc.0" (was "0.800.0")...
    Updating package.json with dependency ng-packagr @ "9.0.0-rc.1" (was "5.2.0")...
    Updating package.json with dependency @angular/compiler @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/common @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/forms @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/platform-browser @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/animations @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency typescript @ "3.6.4" (was "3.4.5")...
    Updating package.json with dependency @angular/platform-server @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/router @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency @angular/platform-browser-dynamic @ "9.0.0-rc.0" (was "8.0.0")...
    Updating package.json with dependency rxjs @ "6.5.3" (was "6.5.2")...
    Updating package.json with dependency zone.js @ "0.10.2" (was "0.9.1")...
UPDATE package.json (13504 bytes)
√ Packages installed successfully.
** Executing migrations of package '@angular/cli' **

>  Update an Angular CLI project to version 9.
Could not find (src/dev/tsconfig.spec.json)
×  Migration failed. See above for further details.

Instead we should warn the user and process with the rest of the update process.

[angular-automatic-lock-bot]

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