remove whitespaces in blank line

Author: ApaDoctor

_pytest/python.py

@@ -85,7 +85,7 @@ def pytest_addoption(parser):
     parser.addini("disable_test_id_escaping_and_forfeit_all_rights_to_community_support", type="bool",
                   default=False, help="disable string escape non-ascii"
                                       " characters, might cause unwanted side effects")
-      
+    
     group.addoption("--import-mode", default="prepend",
                     choices=["prepend", "append"], dest="importmode",
                     help="prepend/append to sys.path when importing test modules, "