Fixed null reference error in AddUserRecordToTeamRequest

[durgaprasadkatari]

[durgaprasadkatari]

@jordimontana82 - There is a bug in the AddUserRecordToTeamRequestExecutor, I have fixed it. Could you please review this PR when you have some time, thanks.

[durgaprasadkatari]

@jordimontana82 - sorry I accidentally closed the PR. Please merge it with master and include it in your next release please.

[jordimontana82]

recheck

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