fix "cannot concatenate 'str' and 'list' objects"

camptocamp · Jun 22, 2016 · d8fd840 · d8fd840
1 parent 7c388c3
commit d8fd840
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/marabunta/model.py b/marabunta/model.py
@@ -96,7 +96,7 @@ def demo_operations(self):
 
     def upgrade_addons_operation(self, addons_state):
         install_command = self.options.install_command
-        install_args = self.options.install_args[:]
+        install_args = self.options.install_args[:] or []
         install_args += [u'--workers=0', u'--stop-after-init']
 
         installed = set(a.name for a in addons_state