* CircleCI: Run golangci-lint in two batches

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* CircleCI: Fix typo

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Chore: adds fallback value to time series class

* Chore: changes fallback value from null to empty string in FilterInput component

* Update public/app/core/time_series2.ts

Co-Authored-By: Hugo Häggmark <hugo.haggmark@grafana.com>

* Chore: updates || to ?? operators

Co-authored-by: Lukas Siatka <lukasz.siatka@grafana.com>
Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>