patch 8.1.1424: crash when popup menu is deleted while waiting for char

Problem:    Crash when popup menu is deleted while waiting for char.
Solution:   Bail out when pum_array was cleared.
diff --git a/src/version.c b/src/version.c
index 2d70ed5..89068d8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1424,
+/**/
     1423,
 /**/
     1422,