added check if bucket and file exists, so that media record can be de…

[ZombieAlienRobot]

…leted without an object

Description of changes

Added fix to delete mediarecord without adding object to minio

How has this been tested?

Please describe the test strategy you followed.

• [ ] automated unit test
• [ ] automated integration test
• [ ] automated acceptance test
• [X] manual, exploratory test

In case of manual test, please document the test well including a set of user instructions and prerequisites. Each including an action, it's result, and where appropriate a screenshot. In case of automated tests, the test coverage should be reasonably high, especially on Service classes and other classes with complex logic.

Checklist before requesting a review

• [ ] My code follows the coding guidelines of this project
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My code fulfills all acceptance criteria
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] The test coverage (line and branch) is reasonably high, especially on Service classes and other classes with complex logic
• [ ] I have made corresponding changes to the documentation
• [ ] I have added explanation of architectural decision and rationales to wiki/adr
• [ ] I have updated the changes in the ticket description

Checklist for reviewer

• [ ] The code works and does not throw errors
• [ ] The code is easy to understand and there are no confusing parts
• [ ] The code follows the coding guidelines of this project
• [ ] The code change accomplishes what it is supposed to do
• [ ] I cannot think of any use case in which the code does not behave as intended
• [ ] The added and existing tests reasonably cover the code change
• [ ] I cannot think of any test cases, input or edge cases that should be tested in addition
• [ ] Description of the change is included in the documentation