validate: only check device when they are devices

We only validate the devices that are passed if there is a list of
devices to validate.

Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit 2888c0825f)

roles/ceph-validate/tasks/check_devices.yml

@@ -24,19 +24,20 @@
   register: dedicated_device_parted
   with_items: "{{ dedicated_devices }}"
   when:
-    - osd_scenario == 'non-collocated'
+    - dedicated_devices|default([]) | length > 0
 
 - name: fail if one of the dedicated_device is not a device
   fail:
     msg: "{{ item }} is not a block special file!"
   with_items: "{{ dedicated_device_parted.results }}"
   when:
-    - osd_scenario == 'non-collocated'
+    - dedicated_devices|default([]) | length > 0
     - item.failed
 
 - name: fail if number of dedicated_devices is not equal to number of devices
   fail:
     msg: "Number of dedicated_devices must be equal to number of devices. dedicated_devices: {{ dedicated_devices | length }}, devices: {{ devices | length }}"
   when:
-    - osd_scenario == 'non-collocated'
-    - dedicated_devices|length != devices|length
+    - dedicated_devices|default([]) | length > 0
+    - devices | length > 0
+    - dedicated_devices | length != devices | length

roles/ceph-validate/tasks/main.yml

@@ -61,6 +61,7 @@
   when:
     - osd_group_name in group_names
     - not osd_auto_discovery | default(False)
+    - devices|default([])|length > 0
 
 - name: include check_eth_mon.yml
   include_tasks: check_eth_mon.yml