Newly created instance does not start (when default blueprint `modules` are configured incorrectly)

### Current Behavior

Adding a new instance fails to start.

Logs for instance show:

```
15/01/2024 12:22:07 [system] Launcher version: 1.15.0
15/01/2024 12:22:07 [system] Loading project settings
15/01/2024 12:22:07 [system] Updating project dependencies
15/01/2024 12:22:08 [system] [npm] npm
15/01/2024 12:22:08 [system] [npm] ERR! must provide string spec
15/01/2024 12:22:08 [system] [npm]
15/01/2024 12:22:08 [system] [npm] npm ERR!
15/01/2024 12:22:08 [system] [npm] A complete log of this run can be found in: npm
15/01/2024 12:22:08 [system] [npm] ERR! C:\Users\Stephen\npm-cache\_logs\2024-01-15T12_22_08_079Z-debug-0.log
15/01/2024 12:22:08 [system] Unable to install or update packages
```

Settings for instance show:


---

NOTES:
* At first, I had failed to pull launcher (was on previous ver 1.14). Updated to latest HEAD - same issue
* Upgraded node to 18 LTS latest, pulled all repos, rebuilt node_modules - same issue

### Expected Behavior

* Module list should not have `modules: []`
* Instance should start

### Steps To Reproduce

Running latest main (HEAD) from all repos, create a new instance.

### Environment
- Instances are running Node-RED stack 3.1.3
- FlowFuse version: 1.15_git
- Node.js version: 16.x AND 18.19.x (LTS)
- npm version:
- Platform/OS: Windows 11
- Browser: Chrome latest

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate