bug: App breaks on native iOS device using custom framework

Bug Report

Capacitor Version

npx cap doctor output:

💊   Capacitor Doctor  💊

Latest Dependencies:

  @capacitor/cli: 1.4.0

  @capacitor/core: 1.4.0

  @capacitor/android: 1.4.0

  @capacitor/ios: 1.4.0

Installed Dependencies:

  @capacitor/android not installed

  @capacitor/cli 1.3.0

  @capacitor/core 1.3.0

  @capacitor/ios 1.3.0


  Found 0 Capacitor plugins for ios:
[success] iOS looking great! 👌

Affected Platform(s)

• Android
• iOS
• Electron
• Web

Current Behavior

• I created a simple capacitor application using Ionic CLI (5.4.12) with the following steps:

  ionic start ionic-gomobile-example tabs --capacitor
  ionic build
  npx cap add ios
  npx cap copy
  

• Then I added a custom framework to the iOS application.
• After that I added a native function which calls a function from the framework. The native function is called from the ionic project.
• If I run the iOS application in the Xcode simulator everything works as expected, but when I run the application on a native device I get the following error:

  ⚡️  ERROR: Unable to load public//index.html
  ⚡️  This file is the root of your web app and must exist before
  ⚡️  Capacitor can run. Ensure you've run capacitor copy at least
  ⚡️  or, if embedding, that this directory exists as a resource directory.
  Fatal error: Unexpectedly found nil while unwrapping an Optional value: file /Users/ricoberger/Documents/GitHub/ionic-gomobile-example/node_modules/@capacitor/ios/ios/Capacitor/Capacitor/CAPBridgeViewController.swift, line 160
  2019-11-24 17:29:37.060529+0100 App[23071:10467244] Fatal error: Unexpectedly found nil while unwrapping an Optional value: file /Users/ricoberger/Documents/GitHub/ionic-gomobile-example/node_modules/@capacitor/ios/ios/Capacitor/Capacitor/CAPBridgeViewController.swift, line 160
  (lldb) 
  

Expected Behavior

The application should also start on the native device, without an error.

On Android the application works on the simulator and on a native device. The iOS framework is also working within a native app, so I think the bug is within Capacitor.

Sample Code or Sample Application Repo

The issue is reproducible with the following code: https://github.com/ricoberger/ionic-gomobile-example

Other Technical Details

npm --version output: 6.13.2

node --version output: v13.3.0

pod --version output (iOS issues only): 1.8.4

Other Information

Maybe related to #2184

[codeRenegade]

Still getting this issue with

💊   Capacitor Doctor  💊 

Latest Dependencies:

  @capacitor/cli: 2.4.2
  @capacitor/core: 2.4.2
  @capacitor/android: 2.4.2
  @capacitor/electron: 2.4.2
  @capacitor/ios: 2.4.2

Installed Dependencies:

  @capacitor/cli 2.4.2
  @capacitor/ios 2.4.2
  @capacitor/core 2.4.2
  @capacitor/android 2.4.2
  @capacitor/electron not installed

  Found 0 Capacitor plugins for ios:
[success] iOS looking great! 👌

I am learning and playing without ionic but as a standalone.

[ionitron-bot[bot]]

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