Fix loading env GOOGLE_APPLICATION_CREDENTIALS

[zaironjacobs]

Description

The type for GOOGLE_APPLICATION_CREDENTIALS was changed from dict to str | None in settings.py. Previously a crash would occur if the provided value is not a valid JSON or is empty. Now, an attempt to load the env variable as a dictionary is done in google_embeddings.py within a try-except block, when this is successful, the Google models will be loaded, else they are not available.

Fixes #12

Type of change

• Bug fix (non-breaking change which fixes an issue)

Testing

Tested the following to make sure the app does not crash:

• Start app without the env GOOGLE_APPLICATION_CREDENTIALS.
• Start app with an invalid JSON at GOOGLE_APPLICATION_CREDENTIALS.
• Start app with a valid JSON at GOOGLE_APPLICATION_CREDENTIALS where the content does not contain the keys expected (the expected content is the content of credentials.json).

[woodthom2]

Thanks @zaironjacobs !