when gets evaluated INSIDE the with loop, so it cannot condition the
executing of with, this is done so you can do when: item == 'blah' for
example to condition each iteration in the loop.
to deal with undeinfed with_ vars, do the following:
with_ : "{{ myvar|default([])}}"
^ the empty [] will skip the task as there is nothing to loop over.
some times you need more complex conditions, ternary filter can help:
with_ : "{{ unexisting is defined|ternary( groups['unexisting'], []) }}"
--
Brian Coca
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