Fix ido-enable-dot-prefix for empty choice (Bug#26997)

* lisp/ido.el (ido-set-matches-1): Only check first character of
item if it's non-empty.

Copyright-paperwork-exempt: yes

1 files changed, 4 insertions, 3 deletions

diff --git a/lisp/ido.el b/lisp/ido.el
index 1393d3b7107..07a5bcf7229 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -3802,9 +3802,10 @@ frame, rather than all frames, regardless of value of `ido-all-frames'."
          (lambda (item)
            (let ((name (ido-name item)))
              (if (and (or non-prefix-dot
-                          (if (= (aref ido-text 0) ?.)
-                              (= (aref name 0) ?.)
-                            (/= (aref name 0) ?.)))
+                          (and (> (length name) 0)
+                               (if (= (aref ido-text 0) ?.)
+                                   (= (aref name 0) ?.)
+                                 (/= (aref name 0) ?.))))
                       (string-match re name))
                  (cond
                   ((and (eq ido-cur-item 'buffer)