patch 8.2.0746: popup_clear() hangs when a popup can't be closed

Problem:    popup_clear() hangs when a popup can't be closed.
Solution:   Bail out when a popup can't be closed.
diff --git a/src/version.c b/src/version.c
index aa88847..37548b2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    746,
+/**/
     745,
 /**/
     744,