Don't request completions for zero-length input

Fixes a bug in which incorrect completion output was displayed, for
example when point was after a closing paren.

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index f75b5cb51ae12084150ef631d35c9f9492f99213..47bdef2c9285033ac9ab4e798c718edf5b1bf4b9 100644 (file)
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1633,8 +1633,9 @@ completions on the current context."
                     (string-match "^\\(from\\|import\\)[ \t]" line))
                (python-shell-completion--get-completions
                 line process python-shell-module-completion-string-code)
-             (python-shell-completion--get-completions
-              input process python-shell-completion-string-code)))
+             (and (> (length input) 0)
+                  (python-shell-completion--get-completions
+                   input process python-shell-completion-string-code))))
           (completion (when completions
                         (try-completion input completions))))
       (cond ((eq completion t)