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🐞 Bug report

Command (mark with an x)

<!-- Can you pin-point the command or commands that are effected by this bug? --> <!-- ✍️edit: -->

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

Is this a regression?

<!-- Did this behavior use to work in the previous version? --> <!-- ✍️--> No, this issue only applies to updating from version 7 to 8.

Description

<!-- ✍️--> I'm unable to update @angular/material when following the update instructions for a basic application. After updating the project with ng update @angular/cli @angular/core, I'm receiving an error when attempting to run ng update @angular/material.

🔬 Minimal Reproduction

<!-- Simple steps to reproduce this bug.

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1. Create a new application with the CLI v7.3.9 ng new update-test --routing --style scss
2. cd into the app's root directory and add angular material ng add @angular/material
3. Select the Indigo/Pink theme, yes to HammerJS and browser animations
4. Begin the update process to v8 ng update @angular/cli @angular/core
5. Update material ng update @angular/material

The error should appear after entering the command in step 5 and before the schematic executes.

🔥 Exception or Error

<pre><code> <!-- If the issue is accompanied by an exception or an error, please share it below: --> <!-- ✍️--> Repository is not clean. Please commit or stash any changes before updating. </code></pre>

🌍 Your Environment

<pre><code> <!-- run ng version and paste output below --> <!-- ✍️--> _ _ ____ _ ___ / \ _ __ __ _ _ | | __ _ _ __ / | | | | / △ \ | ' \ / _| | | | |/ _ | '| | | | | | | / ___ | | | | (| | || | | (| | | | || |___ | | // __| ||_, |_,||_,|| _||_| |___/

Angular CLI: 8.0.0 Node: 12.3.1 OS: darwin x64 Angular: 8.0.0 ... animations, cli, common, compiler, compiler-cli, core, forms ... language-service, platform-browser, platform-browser-dynamic ... router

Package Version

@angular-devkit/architect 0.800.0 @angular-devkit/build-angular 0.800.0 @angular-devkit/build-optimizer 0.800.0 @angular-devkit/build-webpack 0.800.0 @angular-devkit/core 8.0.0 @angular-devkit/schematics 8.0.0 @angular/cdk 7.3.7 @angular/material 7.3.7 @ngtools/webpack 8.0.0 @schematics/angular 8.0.0 @schematics/update 0.800.0 rxjs 6.5.2 typescript 3.4.5 webpack 4.30.0 </code></pre>

Anything else relevant? <!-- ✍️Is this a browser specific issue? If so, please specify the browser and version. -->

<!-- ✍️Do any of these matter: operating system, IDE, package manager, HTTP server, ...? If so, please mention it below. --> I was able to reproduce on both Windows 10 and OS X.