add conditions to check if stdout or stdout_lines is empty

roles/download/tasks/main.yml

@@ -35,6 +35,7 @@
       with_items: "{{ (node_images_raw.stdout | from_json).images }}"
       when:
         - image_command_tool == 'crictl'
+        - node_images_raw.stdout != ''
     # In case of nerdctl or docker, the output is already in the expected format
     # {"Digest":"sha256:847423221ed040798e47df36450edce5581ed642cd087ccb210532764da38b23","Repository":"quay.io/coreos/etcd","Tag":"v3.5.12"}
     # {"Digest":"sha256:34fc87c4a60c0b3ba3b3608871f4494de8072c02808a4151953068f2d7c87743","Repository":"flannel/flannel","Tag":"latest"}
@@ -43,6 +44,7 @@
         node_images: "{{ node_images_raw.stdout_lines | map('from_json') | list }}"
       when:
         - image_command_tool in ['nerdctl', 'docker']
+        - when node_images_raw.stdout_lines != ''
 
 - name: Show node images
   debug: