fix(jira): check if "issues" field is defined in response

[anicke]

Hopefully solves #212

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 56ef14b0f191a033db1a6c4bab5410e1a8ed6d6b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

| Name | Type | | --------------------------------------------- | ----- | | @axis-backstage/plugin-jira-dashboard-common | Patch | | @axis-backstage/plugin-jira-dashboard | Patch | | app | Patch | | @axis-backstage/plugin-jira-dashboard-backend | Patch | | backend | Patch |

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