API-server: returned values when setting metadata are wrong

[sanderegg]

Setting project metadata properly sets the metadata in the database, but the returned values on the client side are all converted to some booleans.

In the above image, for example job_id was set as a string containing a UUID, and a True value is returned. Basically all of them returned values look wrong.

[pcrespov]

Based on the tests i have done, this seems to be the osparc client who is wrongly serializing the values