Validate at least on item in ToDo List

[Timothy Harris]

What is the easiest way to create a validator to ensure at least one entry in a ToDo List custom field? 

Anybody using this plugin and have done this before?

[Timothy Harris]

@Andrey Markelov : Sorry it was unclear, but no worries, I have solved the issue. Thank you for taking the time to respond :-)

[Andrey Markelov]

Hello (I am plugin developer), I cannot catch all messages in answers, sorry. I am a little bit don't understand what you are doing. The field value is JSON string. Do you want to have order?

[Timothy Harris]

I am trying to use script runner simple scripted validator. Getting unexpected behavior. So I added an assert like this: assert cfValues['Acceptance Criteria'] == null "Acceptance Criteria" is the ToDo list custom field. The assert outputs the following: assert cfValues['Acceptance Criteria'] == null | | | | | false | [{"id":"bobbhy","type":"todo"}] [Acceptance Criteria:[{"id":"bobbhy","type":"todo"}], Approval Status:null, Area:null, Epic Link:null, Epic/Theme:null, Flagged:null, Rank:1|hzzzzr:, Release Version History:null, Sprint:null, issueFunction:null] So Obviously the ToDO custom field is not null. But how do I get to the first entry?