patch 8.0.0998: strange error when using K while only spaces are selected

Problem:    Strange error when using K while only spaces are selected.
            (Christian J. Robinson)
Solution:   Check for blank argument.
diff --git a/src/version.c b/src/version.c
index d2f728a..766bd86 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    998,
+/**/
     997,
 /**/
     996,