fix variables

defaults/main.yml

@@ -2,5 +2,5 @@
 nextcloud_instances: []
 nextcloud_user: "cloud"
 nextcloud_path: "/var/www/nextcloud"
-php_binary: "php"
-php_arguments: ""
+php_binary_default: "php"
+php_arguments_default: ""

tasks/main.yml

@@ -4,8 +4,8 @@
   vars:
     nextcloud_user: "{{ nc_instance.nextcloud_user }}"
     nextcloud_path: "{{ nc_instance.nextcloud_path }}"
-    php_binary: "{{ nc_instance.php_binary }}"
-    php_arguments: "{{ nc_instance.php_arguments }}"
+    php_binary: "{{ nc_instance.php_binary | default(php_binary_default) }}"
+    php_arguments: "{{ nc_instance.php_arguments | default(php_arguments_default) }}"
   loop_control:
     loop_var: "nc_instance"
-  loop: "{{ nextcloud_instances }}"
+  loop: "{{ nextcloud_instances }}"