Synthetics-Info Header Causing NPE

[deleonenriqueta]

Description

When a synthetics request is sent, the request contains an X-NewRelic-Synthetics header, but the agent is expecting both the X-NewRelic-Synthetics header and the X-NewRelic-Synthetics-Info header. When an X-NewRelic-Synthetics-Info header is not a part of the request, null values are added to the InboundHeaderState where information from the X-NewRelic-Synthetics-Info would have been. The agent is then trying to add those null attributes from the InboundHeaderState to the intrinsic attributes of transactions. This is causing the NullPointerException.

Acceptance Criteria

1. Add null checks to prevent NPE's when adding attributes from the InboundHeaderState to transaction intrinsic attributes in Transaction.java:
   

2. Add a null check to prevent unnecessary parsing of X-NewRelic-Synthetics-Info in InboundHeaderState.java:
   

[workato-integration]

https://new-relic.atlassian.net/browse/NR-215939