I could not get code similar to yours to work.  I did get it to work with 
these changes:
- name: lv-test
  command: lvdisplay /dev/vg{{ inventory_hostname_short }}/lv_ekb
  register: lvdisp

-name: make-lv
  lvol:
    vg: vg_{{ inventory_hostname_short }}
    lv: lv_ekb
    size: 100%FREE
    shrink: no
    state: present
  become: true
  when: lvdisp.rc|int != 0


this seems to be working.  Thanks so much for your help!

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