[gobject-introspection] scanner: Only warn about signal parameters if there are some

[Colin Walters <walters src gnome org>]

commit 4613390bcfd6a814685a5862925b11338b797e48
Author: Colin Walters <walters verbum org>
Date:   Tue May 7 18:41:48 2013 -0400

    scanner: Only warn about signal parameters if there are some
    
    We don't want to emit a warning if there are actually no parameters.

 giscanner/maintransformer.py |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/giscanner/maintransformer.py b/giscanner/maintransformer.py
index 6acc594..11bfb4c 100644
--- a/giscanner/maintransformer.py
+++ b/giscanner/maintransformer.py
@@ -797,7 +797,9 @@ class MainTransformer(object):
                 # phase we can refer to them while resolving annotations.
                 for i, param in enumerate(signal.parameters):
                     param.argname, tag = names[i + 1]
-            else:
+            elif len(signal.parameters) != 0:
+                # Only warn about missing params if there are actually parameters
+                # besides implicit self.
                 message.warn("incorrect number of parameters in comment block, "
                              "parameter annotations will be ignored.", block.position)