Follow-up for project-defined dashboard shows 'no data found' issue

Summary

This is a follow-up issue following the conversation here !16589 (comment 219572792). The current issue should be worked on only after this is resolved !17151 (merged)

Improvements

There is an additional check for chart.id here https://gitlab.com/gitlab-org/gitlab-foss/blob/master/app/assets/javascripts/monitoring/stores/utils.js#L49 which should not be needed after the normalizeMetric got introduced in this MR.

This can be improved to check only for chart.metricId.

Risks

There are no risks as this stage.

Involved components

This line should be changed https://gitlab.com/gitlab-org/gitlab-foss/blob/master/app/assets/javascripts/monitoring/stores/utils.js#L49

Optional: Intended side effects

Optional: Missing test coverage

/cc @jivanvl