Cannot generate angular module with routing in ionic

_Original issue by @kyawswa on [2019-11-08T08:06:22Z](https://github.com/ionic-team/ionic/issues/19869)_

I have a problem to generate modules with routing in ionic project.

I created new ionic project from ionic start routing blank. And I generate module with routing as the following commands.

`ionic g m heroes --route heroes --module app-routing.module`
or
`ng g m heroes --route heroes --module app-routing.module`
I got this error.
```
File heroes/heroes.module.ts does not exist.
[ERROR] Could not generate module.
```
If I generate modules like this in pure Angular project, it perfectly work. I used Ionic 5.4.4 and Angular 8.

Reproduce the issue in an Ionic 5.4.4 project created with `ionic start routing blank`, then run the two reported module-generation commands using `app-routing.module`. Trace why generation expects `heroes/heroes.module.ts`; done means the command completes and creates the routed module without the reported error.

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