Remove redundant check for duplicate environments (it is not needed

since result is a set)

Author: pelme

generate_configurations.py

@@ -165,10 +165,6 @@ def generate_default_envs(envs):
 
     def find_and_add(variations, env_getter):
         for variation in variations:
-            for existing in result:
-                if env_getter(existing) == variation:
-                    break
-
             for env in reversed(envs):
                 if env_getter(env) == variation:
                     result.add(env)