patch 8.2.4896: expression in command block does not look after NL

Problem:    Expression in command block does not look after NL when command is
            typed.
Solution:   Skip over NL also when not in a script. (closes #10358)
diff --git a/src/eval.c b/src/eval.c
index 18e196f..317446c 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -2175,7 +2175,8 @@
     *getnext = FALSE;
     if (in_vim9script()
 	    && evalarg != NULL
-	    && (evalarg->eval_cookie != NULL || evalarg->eval_cctx != NULL)
+	    && (evalarg->eval_cookie != NULL || evalarg->eval_cctx != NULL
+								   || *p == NL)
 	    && (*p == NUL || *p == NL
 			     || (vim9_comment_start(p) && VIM_ISWHITE(p[-1]))))
     {