patch 8.2.4506: "pattern not found" for :global is not an error message

Problem:    "pattern not found" for :global is not an error message.
Solution:   In Vim9 script make this an actual error, so that try/catch can be
            used as expected.
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 91a2fa7..d926df5 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -5001,9 +5001,19 @@
 	else if (ndone == 0)
 	{
 	    if (type == 'v')
-		smsg(_("Pattern found in every line: %s"), pat);
+	    {
+		if (in_vim9script())
+		    semsg(_(e_pattern_found_in_every_line_str), pat);
+		else
+		    smsg(_("Pattern found in every line: %s"), pat);
+	    }
 	    else
-		smsg(_("Pattern not found: %s"), pat);
+	    {
+		if (in_vim9script())
+		    semsg(_(e_pattern_not_found_str), pat);
+		else
+		    smsg(_("Pattern not found: %s"), pat);
+	    }
 	}
 	else
 	{