[UBS] Management Order Controller PUT Update employee position by order

[MyloslavaM]

Environment: mac OS Big Sur 11,2 , browser Firefox 91.0b9
Reproducible: always

Preconditions

1. User is logged in as administrator

2. Order has been already created
   

Steps to reproduce

1. Go to 'https://greencity-ubs.azurewebsites.net/ubs/management/update-position-by-order'
2. Click submit
   Actual result
   {
   "timestamp": "2021-08-21T07:03:56.761+0000",
   "status": 500,
   "error": "Internal Server Error",
   "message": "Index 1 out of bounds for length 1",
   "path": "/ubs/management/update-position-by-order"
   }

Expected result
The administrator has the opportunity to manipulate data of employee position

User story and test case links
E.g.: "User story #2780

Labels to be added
"Bug", Priority ("pri: "), Severity ("severity:"), Type ("UI, "Functional"), "API" (for back-end bugs).

[mvyno]

Verified - controller works as expected