Reporter is missing when user completes issue save in Jira (cloud only)

[DHaussermann]

There is an issue when a task has unsupported custom fields and the user must navigate to Jira to finish saving their issue. In this case, once the user navigates to Jira, the reporter field is empty instead of being set to the current user. This happens on Jira Cloud only. Server instances to not seem affected. I don't believe that this is a regression from Jira 2.4

Steps:

• Configure a Jira project such that an unsupported custom field is mandatory (ex: Radio button)
• Connect test user from Mattermost
• Create a Jira issue from a post
• Add detail in the modal and save
• Click the link that is created to complete issue creation in Jira

Observed When you navigate to Jira, the Reporter field is empty.