HeterodynedPulsarModel: fix minor bug in if statement
This is a bug fix in the calculation of the pulsar signal phase where an if statement checks the wrong array for a NULL value.
API Changes and Justification
Backwards Compatible Changes
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- This change adds new API calls
Backwards Incompatible Changes
- This change modifies an existing API
- This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.