Couldn't find a route declaration in the module file

[nzbin]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [X] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

I don't know

Description

When create a module with --route in another module, it will throw error. But if the parent module is --flat=true, it's correct.

🔬 Minimal Reproduction

$ ng g module a --routing=true
$ ng g module b -m=a --route=b
# throw error
Couldn't find a route declaration in /src/app/a/a.module.ts.

It will be correct as following.

$ ng g module a --routing=true --flat=true
$ ng g module b -m=a --route=b

🔥 Exception or Error

Couldn't find a route declaration in /src/app/a/a.module.ts.

🌍 Your Environment

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 8.2.2
Node: 10.15.0
OS: darwin x64
Angular: 8.2.5
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.802.2
@angular-devkit/build-angular     0.802.2
@angular-devkit/build-optimizer   0.802.2
@angular-devkit/build-webpack     0.802.2
@angular-devkit/core              8.2.2
@angular-devkit/schematics        8.2.2
@angular/cdk                      8.1.4
@angular/cli                      8.2.2
@angular/flex-layout              8.0.0-beta.27
@angular/material                 8.1.4
@ngtools/webpack                  8.2.2
@schematics/angular               8.2.2
@schematics/update                0.802.2
rxjs                              6.4.0
typescript                        3.5.3
webpack                           4.38.0

Anything else relevant?

[nzbin]

It's because the routingModulePath is incorrect.
I have made a pr (#15553)

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