fix(build): fix path error when appConfig has no main

[filipesilva]

Fixes a path error when main is missing in angular-cli.json:

kamik@T460p MINGW64 /D/sandbox/master-proj
$ ng build

Path must be a string. Received undefined
TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.resolve (path.js:184:7)
# ...

[hansl]

From what I understand this also allows people to use the CLI for apps that have no main at all, correct?

[filipesilva]

@hansl yes, it will simply compile scripts and styles if there is no main. Was planning on using it to test the Angular ES5 examples on docs.

[hansl]

Could you verify that console.log('hello') is in the output? Alternatively, does ng serve still work? I'd rather test that.

[filipesilva]

Done

[hansl]

LGTM.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}