patch 8.2.3158: strange error message when using islocked() with a number

Problem:    Strange error message when using islocked() with a number.
            (Yegappan Lakshmanan)
Solution:   Check that the name is empty.
diff --git a/src/version.c b/src/version.c
index ace5a9d..3de3048 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3158,
+/**/
     3157,
 /**/
     3156,