patch 8.2.3948: Vim9: failure with partial with unknown argument count

Problem:    Vim9: failure with partial with unknown argument count.
Solution:   Do not copy argument types if there aren't any.
diff --git a/src/version.c b/src/version.c
index 56825f5..a362dca 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3948,
+/**/
     3947,
 /**/
     3946,