无法在csv中插入可见的寄存器输出

Question

下面是我的代码:

- name: Check last usage history
  shell: |
    mysql -N --host={{ host }} 
    --user={{ user }} 
    --password={{ pass }} 
    -D db 
    -e "SELECT LEFT(CreationTime,LOCATE(' ',CreationTime) - 1) from table;"
  register: last_usage
  when: products != "1" and products != "2" and products != "3"
- name: Check last modified
  shell: |
    mysql -N --host={{ host }} 
    --user={{ user }} 
    --password={{ password }} 
    -D db  
    -e "SELECT LEFT(ModificationTime,LOCATE(' ',ModificationTime) - 1) FROM table2"
  register: last_modi
  when: products == "1 or products == "3" or products == "2"
- name: insert data in csv
  shell: |
      echo "{{ name }}{{ last_usage.stdout }} {{ last_modi.stdout }}" >> /home/test/test.csv

如果跳过任务，我想在csv文件中打印变量NULL的输出。现在，它显示

 One or more undefined variables: 'dict object' has no attribute 'stdout'

Answer 1

- name: insert data in csv
  shell: |
      echo "{{ name }}{{ last_usage.stdout | default('NULL') }} {{ last_modi.stdout | default('NULL') }}" >> /home/test/test.csv