[elpa] externals/excorporate b3c028f 2/3: Do not allow empty string as custom time zone

[Thomas Fitzsimmons]

branch: externals/excorporate
commit b3c028f737dbb0f1c666f5d118475c9504565e84
Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
Commit: Thomas Fitzsimmons <fitzsim@fitzsim.org>

    Do not allow empty string as custom time zone
    
    * excorporate-time-zones.el (excorporate-customize-time-zone):
    Detect blank result from completing-read.
---
 excorporate-time-zones.el | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/excorporate-time-zones.el b/excorporate-time-zones.el
index 0a2cd80..3c9b53f 100644
--- a/excorporate-time-zones.el
+++ b/excorporate-time-zones.el
@@ -841,8 +841,9 @@
               (cons "Emacs Built-in"
                     (hash-table-values exco--time-zone-olson-to-server))
               nil t)))
-    (customize-save-variable 'excorporate-time-zone
-                            (if (equal zone "Emacs Built-in") nil zone))))
+    (unless (equal zone "")
+      (customize-save-variable 'excorporate-time-zone
+                              (if (equal zone "Emacs Built-in") nil zone)))))
 
 (defun exco-time-zone (&optional emacs-time-zone)
   "Return server style time zone string.