[gnome-todo/feature/debug-list-creation-failing-silently] eds: Log a debug message if create_source() fails

[Niels De Graef <nielsdg src gnome org>]

commit 0ac2c8f97152186c1939e711f6de33550550f5b7
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Wed Nov 3 21:32:45 2021 +0100

    eds: Log a debug message if create_source() fails
    
    That way, it's easier to debug what actually went wrong.
    
    See https://gitlab.gnome.org/GNOME/gnome-todo/-/issues/116 for more info

 src/plugins/eds/gtd-provider-eds.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/src/plugins/eds/gtd-provider-eds.c b/src/plugins/eds/gtd-provider-eds.c
index 22b0433b..d46d70e8 100644
--- a/src/plugins/eds/gtd-provider-eds.c
+++ b/src/plugins/eds/gtd-provider-eds.c
@@ -795,11 +795,16 @@ gtd_provider_eds_create_task_list (GtdProvider         *provider,
   source = NULL;
 
   /* Create an ESource */
-  if (GTD_PROVIDER_EDS_CLASS (G_OBJECT_GET_CLASS (provider))->create_source)
-    source = GTD_PROVIDER_EDS_CLASS (G_OBJECT_GET_CLASS (provider))->create_source (self);
+  if (!GTD_PROVIDER_EDS_CLASS (G_OBJECT_GET_CLASS (provider))->create_source) {
+    g_debug ("Can't create task list: not supported by %s", G_OBJECT_TYPE_NAME (provider));
+    return;
+  }
 
-  if (!source)
+  source = GTD_PROVIDER_EDS_CLASS (G_OBJECT_GET_CLASS (provider))->create_source (self);
+  if (!source) {
+    g_debug ("Can't create task list: create_source() returned NULL");
     return;
+  }
 
   /* EDS properties */
   e_source_set_display_name (source, name);