fix typo

mmatera · mmatera · commit a6524b46a0b2 · 2021-02-13T15:41:13.000-03:00
diff --git a/mathics/builtin/system.py b/mathics/builtin/system.py
@@ -414,7 +414,7 @@ def evaluate(self, evaluation) -> String:
         try:
             return String(os.getlogin())
         except:
-           evaluation.message('$UserName', 'nologin')
+            evaluation.message('$UserName', 'nologin')
             return
 
 
