Fix Dismiss checkbox on Security Dashboard
### Summary When there are no found vulnerabilities, the checkbox for dismissing vulnerabilities is still visible. ### Steps to reproduce 1. Go to Project Security Dashboard 1. Select Report type when there are no findings. 1. Observe checkbox that bulk dismisses vulnerabilities which isn't hidden. ### Example Project https://gitlab.com/gitlab-org/gitlab/-/security/dashboard ### What is the current *bug* behavior? The checkbox is visible and selected. ### What is the expected *correct* behavior? The checkbox should be visible but not selected. The checkbox should never be in a selected state unless a user has intentionally selected it. ### Relevant logs and/or screenshots ![Screenshot_2020-06-03_at_15.13.05](/uploads/00acc938ac4fe341d5be4e962760e38e/Screenshot_2020-06-03_at_15.13.05.png) ### Possible fixes TBA /cc @lkerr
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