Jinja2 template variable if None Object set a default value
Use the none test (not to be confused with Python's None object!):
{% if p is not none %}
{{ p.User['first_name'] }}
{% else %}
NONE
{% endif %}
or:
{{ p.User['first_name'] if p is not none else 'NONE' }}
or if you need an empty string:
{{ p.User['first_name'] if p is not none }}
{{p.User['first_name'] or 'My default string'}}