Bug 37856: Consider 'Exceptions' not being part of 'Report_Header'

Bug 37856: Consider 'Exceptions' not being part of 'Report_Header'

When fixing the issue around the missing platform parameter, we
noticed this particular provider also returns 'Exceptions' as
its own thing, not part of 'Report_Header', despite documentation:
https://countermetrics.stoplight.io/docs/counter-sushi-api/7cp0h7n1hm2en-tr-j1-journal-requests-controlled

From the link above, search for 'Exceptions'. Notice it should be under 'Report_Header'.
Either way, this patch accounts for this possibility.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>