Check is not None in safe get

Author: qlemaire22

config/kube_config.py

@@ -494,7 +494,7 @@ def __len__(self):
 
     def safe_get(self, key):
         if (isinstance(self.value, list) and isinstance(key, int) or
-                key in self.value):
+                self.value is not None and key in self.value):
             return self.value[key]
 
     def __getitem__(self, key):