[Bug] undefined image.size

[barthofu]

What happened?

When the automaticUploadImagesToImgur option is set to true but no imgur client_id is referenced in the .env, the upload to imgur fails and some properties of the Image entity are not defined.

Fixes todo:

• turn off by default the option in the config
• add a special handling in case of failure of the upload in the service
• in the check before the call of the service (in the main.ts), don't just check if the IMGUR_CLIENT_ID env variable is set but that's also different from the default value of the .env.example

Reproduction

1. Set automaticUploadImagesToImgur config option to true
2. Set the IMGUR_CLIENT_ID env variable as an invalid client_id
3. Add an image in the assets/ folder
4. Start the bot

Relevant log output

No response

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