Confusing error message displayed during cadence generation error

[talister]

Trying to submit a cadence for C/2020 O2 from 2020-10-05 21:00->2020-11-01 00:00 with period=72, jitter=24 hours resulted in

It was not possible to submit your request to the scheduler. Additional information: requests: This field is required. name: This field is required. observation_type: This field is required. operator: This field is required. ipp_value: This field is required. proposal: This field is required. 

in the NEOx popup box. The actual error from the logs at AWS shows:

[05/Oct/2020 20:58:26] ERROR Cadence generation error
[05/Oct/2020 20:58:26] ERROR {'errors': 'No visible requests within cadence window parameters'}
[05/Oct/2020 20:58:26] ERROR {'requests': ['This field is required.'], 'name': ['This field is required.'], 'observation_type': ['This field is required.'], 'operator': ['This field is required.'], 'ipp_value': ['This field is required.'], 'proposal': ['This field is required.']}
[05/Oct/2020 20:58:26] ERROR {'requests': ['This field is required.'], 'name': ['This field is required.'], 'observation_type': ['This field is required.'], 'operator': ['This field is required.'], 'ipp_value': ['This field is required.'], 'proposal': ['This field is required.']}

We should probably prioritize reporting the 'errors' key before the 'requests' one