allow skipping package installation for smoker/pytest

this allows to run the smoker role without passing the sudo password

Author: evgeni

roles/pytest_project/tasks/install.yml

@@ -4,6 +4,8 @@
   package:
     name: "{{ pytest_project_packages }}"
     state: present
+  when:
+    - pytest_project_packages | length > 0
 
 - name: Clone project
   git:

roles/smoker/tasks/main.yml

@@ -3,6 +3,8 @@
   become: true
   package:
     name: '{{ smoker_browser_packages }}'
+  when:
+    - smoker_browser_packages | length > 0
 
 - name: 'Install Smoker via pytest_project'
   include_role: