Check CI SRC paths passed via system environment variable

platformio/util.py

@@ -259,9 +259,7 @@ def is_ci():
 def exec_command(*args, **kwargs):
     result = {"out": None, "err": None, "returncode": None}
 
-    default = dict(
-        stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE)
+    default = dict(stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     default.update(kwargs)
     kwargs = default