Issue with copying the blank/null value of one field to another through pipeline

Chayce is exactly right. I ran into this myself, and it's a bit annoying. Here is the syntax you will need in Pipelines. Instead of simply copying the value (lets use a field called [Date] for the example).

Instead of {{a.date}}, you will use either

{% if a.date is none %}
{{ CLEAR }}
{% else %}
{{a.date}}
{% endif %}

Or you can use this more condensed version:

{{ CLEAR if a.date is none else a.date }}