Description of problem:

Starting RHDH with a malformed entry in the "plugins" array in the dynamic plugin config results in a stack trace being printed, instead of a helpful validation failure.

Prerequisites (if any, like setup, operators/versions):

RHDH 1.7 via Helm

Steps to Reproduce

Create a dynamic plugins config with a malformed entry, e.g this one with the missing "package"

plugins:

• disabled: false
  package: ./dynamic-plugins/dist/backstage-community-plugin-redhat-argocd
• disabled: false

Actual results:

======= Overriding dynamic plugin configuration ./dynamic-plugins/dist/backstage-plugin-notifications-backend-dynamic
======= Overriding dynamic plugin configuration ./dynamic-plugins/dist/backstage-plugin-signals-backend-dynamic
Traceback (most recent call last):
File "/opt/app-root/src/install-dynamic-plugins.py", line 658, in <module>
main()
File "/opt/app-root/src/install-dynamic-plugins.py", line 615, in main
mergePlugin(plugin, allPlugins, dynamicPluginsFile)
File "/opt/app-root/src/install-dynamic-plugins.py", line 458, in mergePlugin
package = plugin['package']
~~~~~~^^^^^^^^^^^
KeyError: 'package'
======= Removed lock file: /dynamic-plugins-root/install-dynamic-plugins.lock

Expected results:

A better validation error, e.g "entry in the 'plugins' array is malformed: missing 'package' key'

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

RHDH 1.7

Additional info (Such as Logs, Screenshots, etc):