Addons: Catch AttributeError when getting ``GunicornReloadMethod`` class
Addons: Catch AttributeError when getting ``GunicornReloadMethod`` class

Catch AttributeError 'module' object has no attribute 'getppid'
in ``GunicornReloadMethod:is_parent_an_unicorn``

Refs SHOOP-1770

hrayr-artunyan/shuup,shoopio/shoop,suutari/shoop,shawnadelic/shuup,shawnadelic/shuup,suutari-ai/shoop,hrayr-artunyan/shuup,suutari/shoop,suutari-ai/shoop,shoopio/shoop,suutari/shoop,shoopio/shoop,hrayr-artunyan/shuup,suutari-ai/shoop,shawnadelic/shuup