Check for NULL pointers in DBG messages to prevent crashes on Solaris, based...

Check for NULL pointers in DBG messages to prevent crashes on Solaris, based on patch from William Bonnet (bug #2922).

(Old svn revision: 24991)

panel/panel-config.c

@@ -360,7 +360,7 @@ start_element_handler (GMarkupParseContext  *context,
                     ++i;
                 }
 
-                if (name != NULL)
+                if (name != NULL && value != NULL)
                 {
                     DBG ("Add item: name=\"%s\", id=\"%s\"", name, value);
 

panel/panel-item-manager.c

@@ -297,6 +297,13 @@ update_plugin_list (void)
     else
     {
         dirs = xfce_resource_dirs (XFCE_RESOURCE_DATA);
+
+        if (G_UNLIKELY(!dirs))
+        {
+            dirs    = g_new (char*, 2);
+            dirs[0] = g_strdup (DATADIR);
+            dirs[1] = NULL;
+        }
     }
     
     for (d = dirs; *d != NULL || !datadir_used; ++d)
@@ -343,9 +350,12 @@ update_plugin_list (void)
                 {
                     DBG (" + class \"%s\": "
                          "name=%s, comment=%s, icon=%s, external=%d, path=%s", 
-                         class->plugin_name,
-                         class->name, class->comment, class->icon,
-                         class->is_external, class->file);
+                         class->plugin_name ? class->plugin_name : "(null)",
+                         class->name        ? class->name        : "(null)", 
+                         class->comment     ? class->comment     : "(null)", 
+                         class->icon        ? class->icon        : "(null)",
+                         class->is_external, 
+                         class->file        ? class->file        : "(null)");
                 
                     g_hash_table_insert (plugin_classes, 
                                          class->plugin_name,