Yeah Nice has given a right solution, make it optional from Field configuration scheme and add a "Field Required Validator" on resolve issue screen.
this will solve the problem.
If you make a field mandatory in Jira, it is mandatory for the whole lifecycle of the issue.
To do what you want here, you make it optional, and add a "validator" to the resolve transition, which will stop the user completing the transition unles the issue has a fix version.
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