[Cleanup] nginx: whitespace + comparison with empty string

nginx/tasks/packages.yml

@@ -10,7 +10,7 @@
   tags:
     - nginx
     - packages
-    
+
 - name: Ensure nginx service is running as configured.
   service:
     name: nginx

nginx/tasks/server_status_read.yml

@@ -14,7 +14,7 @@
     # The last character "\u000A" is a line feed (LF), it's better to keep it
     content: "{{ nginx_serverstatus_suffix }}\u000A"
     force: yes
-  when: nginx_serverstatus_suffix != ""
+  when: nginx_serverstatus_suffix
 
 - name: generate random string for server-status suffix
   shell: "apg -a 1 -M N -n 1 > {{ nginx_serverstatus_suffix_file }}"