patch 8.2.1947: crash when using "zj" without folds

Problem:    Crash when using "zj" without folds. (Sean Dewar)
Solution:   Check for at least one fold. (closes #7245)
diff --git a/src/version.c b/src/version.c
index 3f2affe..015cf4c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1947,
+/**/
     1946,
 /**/
     1945,