995ec00121
Instead of using the frame name as the series name, we now use the name of the series value column if the frame name is not set. Queries to some datasources may end up with an empty frame name, which leads to an empty series name. As the series name is used in the frontend to display which metrics were queried etc. it shouldn't be empty.
(cherry picked from commit 2319c52c85)
Co-authored-by: Jean-Philippe Quéméner <JohnnyQQQQ@users.noreply.github.com>