invalid memory address when building if app is not installed in the API

[davidspek]

Summary

If an application is not installed in the Plural API and a user runs the plural build --only <not-installed-application>, an invalid memory address error will occur.

Reproduction

Run plural build --only ... for an application that is not installed in the API.

CLI UI/UX Issue Screenshots

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x19b9e57]

goroutine 1 [running]:
main.doBuild(0x1efe9d5, 0x0, 0x6)
        /home/david/Plural/plural-cli/cmd/plural/deploy.go:135 +0x37
main.build(0xc000166dc0)
        /home/david/Plural/plural-cli/cmd/plural/deploy.go:118 +0x105
github.com/urfave/cli.HandleAction({0x1b330c0, 0x1fece40}, 0x5)
        /home/david/go/pkg/mod/github.com/urfave/cli@v1.22.5/app.go:524 +0xa8
github.com/urfave/cli.Command.Run({{0x1effa1f, 0x5}, {0x0, 0x0}, {0xc000702530, 0x1, 0x1}, {0x1f20a12, 0x15}, {0x0, ...}, ...}, ...)
        /home/david/go/pkg/mod/github.com/urfave/cli@v1.22.5/command.go:173 +0x652
github.com/urfave/cli.(*App).Run(0xc0001788c0, {0xc00013a000, 0x4, 0x4})
        /home/david/go/pkg/mod/github.com/urfave/cli@v1.22.5/app.go:277 +0x705
main.main()
        /home/david/Plural/plural-cli/cmd/plural/plural.go:346 +0x28f7

Additional Info about Your Environment

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