avoid error when lv not defined

tasks/manage_lvm.yml

@@ -0,0 +1,40 @@
+---
+- name: manage_lvm | manage physical volume group creation
+  include_tasks: create_vg.yml
+
+- name: manage_lvm | loop over logical volume group(s) to create logical volumes
+  include_tasks: create_lv.yml
+  loop: "{{ lvm_groups }}"
+  loop_control:
+    loop_var: vg
+
+- name: manage_lvm | loop over logical volume group(s) to create filesystems
+  include_tasks: create_fs.yml
+  loop: "{{ lvm_groups }}"
+  loop_control:
+    loop_var: vg
+
+- name: manage_lvm | Removing LVM logical volume(s)
+  lvol:
+    vg: "{{ item.0.vgname }}"
+    lv: "{{ item.1.lvname }}"
+    state: "absent"
+    force: yes
+  become: true
+  loop: "{{ lvm_groups|subelements('lvnames') }}"
+  when: >
+    (item.1 is defined and
+    item.1 != 'None') and
+    (item.1.create is defined and
+    not item.1.create)
+
+- name: manage_lvm | Removing LVM volume group(s)
+  lvg:
+    vg: "{{ item.vgname }}"
+    pvs: "{{ item.disks | join(',') }}"
+    state: "absent"
+  become: true
+  loop: "{{ lvm_groups }}"
+  when: >
+    item.create is defined and
+    not item.create