Frontend does not display correctly error message with 5XX

[pcrespov]

Is there an existing issue for this?

• I have searched the existing issues

Which deploy/s?

development (master)

Current Behavior

ON a 5XX response, the front-end does nto display the error message in the respons

Expected Behavior

On a 5XX response, if there is an error message in the response, it should be shown, otherwise use a default message

Steps To Reproduce

In order to reproduce an unexpected error, build and local, checkout master on commit 997eeb3

1. git checkout 997eeb3129754d3295ddbca13afb788f78386a31
2. make build
3. make up-prod
4. in the db select a product (e.g. osparc)
5. remove the groups_extra_properties row associated to that product -> this will make the configuration invalid and in this commit this error was not handled correctly.
6. try to login
7. it will fail displaying a strange message

Anything else?

From #6432, the response is standard

I did a reference to it in #6485 (review) as well.

[odeimaiz]

Fixed in master