Merge "allow empty phony modules"

	p.requiredModuleNames = ctx.RequiredModuleNames()

	p.hostRequiredModuleNames = ctx.HostRequiredModuleNames()

	p.targetRequiredModuleNames = ctx.TargetRequiredModuleNames()

	if len(p.requiredModuleNames) == 0 &&

		len(p.hostRequiredModuleNames) == 0 && len(p.targetRequiredModuleNames) == 0 {

		ctx.PropertyErrorf("required", "phony must not have empty required dependencies "+

			"in order to be useful(and therefore permitted).")

	}

}

func (p *phony) AndroidMk() android.AndroidMkData {