2e reviewed manuscript

20-executors/getflags/httpx-error-tree/tree.py

@@ -5,6 +5,7 @@ import httpx  # make httpx classes available to .__subclasses__()
 
 def tree(cls, level=0, last_sibling=True):
     yield cls, level, last_sibling
+
     # get RuntimeError and exceptions defined in httpx
     subclasses = [sub for sub in cls.__subclasses__()
                   if sub is RuntimeError or sub.__module__ == 'httpx']