Using URL with protocol as baseHref during build removes one slash while using the --localize option

[PierreDuc]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• e2e
• test
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Is this a regression?

The localize option was not available yet

Description

Adding a full URL (https://path.to.assets.app.com) as baseHref to the build command in combination with the --localize removes one slash, resulting the base href in the index.html to be:

<base href="https:/path.to.app.com/{language_code}">

This will fail, because the assets will be loaded from a relative url, with this base href appended to it, which is not very nice

🔬 Minimal Reproduction

Create an app with localization configured, and run the build command:

ng build --baseHref=https://path.to.assets.app.com --prod --localize

🌍 Your Environment

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

Angular CLI: 9.0.2
Node: 12.13.0
OS: win32 x64

Angular: 9.0.1
... animations, common, compiler, compiler-cli, core, elements
... forms, language-service, platform-browser
... platform-browser-dynamic, router, service-worker
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.900.2
@angular-devkit/build-angular      0.900.2
@angular-devkit/build-webpack      0.900.2
@angular-devkit/core               9.0.2
@angular-devkit/schematics         9.0.2
@angular/cdk                       9.0.0
@angular/cli                       9.0.2
@angular/fire                      6.0.0-rc.1
@angular/flex-layout               9.0.0-beta.29
@angular/localize                  9.0.2
@angular/material                  9.0.0
@angular/material-moment-adapter   9.0.0
@ngtools/webpack                   9.0.2
@schematics/angular                9.0.2
@schematics/update                 0.900.2
rxjs                               6.5.4
typescript                         3.7.5
webpack                            4.41.2

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