[seed] Proper handle GHash

[Alan Knowles <alank src gnome org>]

commit 5cbbebaa46a0fed4a21d380ebe353186820b9c9a
Author: Danilo Cesar Lemes de Paula <danilo cesar collabora co uk>
Date:   Tue Jan 26 09:28:47 2016 -0200

    Proper handle GHash

 libseed/seed-closure.c |    2 ++
 libseed/seed-types.c   |    9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/libseed/seed-closure.c b/libseed/seed-closure.c
index 4815cf4..0205c39 100644
--- a/libseed/seed-closure.c
+++ b/libseed/seed-closure.c
@@ -166,6 +166,7 @@ seed_handle_closure (ffi_cif * cif, void *result, void **args, gpointer userdata
          }
        case GI_TYPE_TAG_GLIST:
        case GI_TYPE_TAG_GSLIST:
+       case GI_TYPE_TAG_GHASH:
          arg->v_pointer = *(gpointer *) args[i];
          break;
        default:
@@ -280,6 +281,7 @@ seed_handle_closure (ffi_cif * cif, void *result, void **args, gpointer userdata
       }
     case GI_TYPE_TAG_GLIST:
     case GI_TYPE_TAG_GSLIST:
+    case GI_TYPE_TAG_GHASH:
       *(gpointer *) result = return_arg.v_pointer;
       break;
     default:
diff --git a/libseed/seed-types.c b/libseed/seed-types.c
index 2031589..70a3ef5 100644
--- a/libseed/seed-types.c
+++ b/libseed/seed-types.c
@@ -1221,11 +1221,18 @@ seed_value_from_gi_argument_full (JSContextRef ctx,
             return JSValueMakeNull (ctx);
           }
 
+        hash_table = arg->v_pointer;
+        if (!hash_table)
+          {
+            seed_make_exception (ctx, exception, "ArgumentError",
+                                 "Unable to make hash table indexed with values of type %s", 
g_type_tag_to_string (key_type_tag));
+            return JSValueMakeNull (ctx);
+          }
+
         value_type = g_type_info_get_param_type (type_info, 1);
 
         ret = JSObjectMake (ctx, NULL, NULL);
 
-        hash_table = arg->v_pointer;
         g_hash_table_iter_init (&iter, hash_table);
 
         while (g_hash_table_iter_next (&iter, &key, &value))