How to check if previous shell task returns an empty string

[Dump Hole]

I have two shell tasks.  The first one runs a check and returns a list of ids to be removed.  The second one will remove these ids.

The stdout of the first task looks like this:
1
2
3
4

which then gets fed into the second task to remove 1, 2, 3, 4

But if the first one cannot find ids to be removed, it will instead return an empty string rather than an error.  How do I check in Ansible for an empty string, and how do I pass   I set the variable through register

- name: task1
  shell: script1
  register: result
- name: task2
  shell: script2 `script1`
  when: result.length() > 0   <<<  ??

I tried with stdout_lines.length(), length, size(), size, len().  No luck.

[Brian Coca]

i think you want:
result.stdout|length > 0

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Brian Coca