Fixes #119

Author: haxorof

tasks/postinstall.yml

@@ -50,7 +50,7 @@
       set_fact:
         _docker_additional_packages_os: >
           {{ _docker_additional_packages_os
-            + [((_docker_pip_cmd.rc == 0) | ternary('', docker_pip_package))]
+            + ([] if (_docker_pip_cmd.rc == 0) else [docker_pip_package])
             + [docker_python2_build_os_pkgs[_docker_os_dist]] }}
       when:
         - not _docker_python3 | bool
@@ -59,7 +59,7 @@
       set_fact:
         _docker_additional_packages_os: >
           {{ _docker_additional_packages_os
-            + [((_docker_pip_cmd.rc == 0) | ternary('', docker_pip3_package))]
+            + ([] if (_docker_pip_cmd.rc == 0) else [docker_pip3_package])
             + [docker_python3_build_os_pkgs[_docker_os_dist]] }}
       when:
         - _docker_python3 | bool