Avoid the error when computing top-level indentation.

* lisp/progmodes/python.el (python-indent-calculate-indentation):
Do not apply max to an empty list

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index d340550a017..9bfafeb20cd 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1068,7 +1068,9 @@ minimum."
          (levels (python-indent--calculate-levels indentation)))
     (if previous
         (python-indent--previous-level levels (current-indentation))
-      (apply #'max levels))))
+      (if levels
+          (apply #'max levels)
+        0))))
 
 (defun python-indent-line (&optional previous)
   "Internal implementation of `python-indent-line-function'.