[vala] GIR writer: Avoid generating parameters tag if not necessary

[Jürg Billeter <juergbi src gnome org>]

commit c151c53e622c7b7af62018cf61b044235a85c2da
Author: Didier 'Ptitjes <ptitjes free fr>
Date:   Fri Mar 20 17:27:55 2009 +0100

    GIR writer: Avoid generating parameters tag if not necessary
    
    Signed-off-by: Didier 'Ptitjes <ptitjes free fr>
---
 gobject/valagirwriter.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/gobject/valagirwriter.vala b/gobject/valagirwriter.vala
index a1eb3a2..c4ed73d 100644
--- a/gobject/valagirwriter.vala
+++ b/gobject/valagirwriter.vala
@@ -360,6 +360,10 @@ public class Vala.GIRWriter : CodeVisitor {
 	}
 
 	private void write_params (Gee.List<FormalParameter> params, DataType? instance_type = null) {
+		if (params.size == 0 && instance_type == null) {
+			return;
+		}
+
 		write_indent ();
 		stream.printf ("<parameters>\n");
 		indent++;