[discident-glib] ean: Better error when an Amazon parameter is missing

[Bastien Nocera <hadess src gnome org>]

commit a8f76ccbe1bc0050afaf3299723ff4a58f73e7f9
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Dec 21 20:24:58 2015 +0100

    ean: Better error when an Amazon parameter is missing

 discident-glib/discident-ean-glib.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/discident-glib/discident-ean-glib.c b/discident-glib/discident-ean-glib.c
index 5c24fa9..1124ef0 100644
--- a/discident-glib/discident-ean-glib.c
+++ b/discident-glib/discident-ean-glib.c
@@ -88,7 +88,17 @@ parameters_are_valid (DiscidentEan  *ean,
            ean->priv->associate_tag != NULL)
                return TRUE;
 
-       g_set_error (error, DISCIDENT_ERROR, DISCIDENT_ERROR_MISSING_PARAMETERS, "Parameters are missing to 
access this web service");
+       if (ean->priv->access_key == NULL) {
+               g_set_error (error, DISCIDENT_ERROR, DISCIDENT_ERROR_MISSING_PARAMETERS,
+                            "Access key is missing to access this web service");
+       } else if (ean->priv->private_key == NULL) {
+               g_set_error (error, DISCIDENT_ERROR, DISCIDENT_ERROR_MISSING_PARAMETERS,
+                            "Private key is missing to access this web service");
+       } else if (ean->priv->associate_tag == NULL) {
+               g_set_error (error, DISCIDENT_ERROR, DISCIDENT_ERROR_MISSING_PARAMETERS,
+                            "Associate tag is missing to access this web service");
+       }
+
        return FALSE;
 }