testbot/lib: Improve Collection::Validate()'s error reporting.

[Francois Gouget]

The error message contains no information about the Collection so it should mention the guilty Item's full key.
---
 testbot/lib/ObjectModel/Collection.pm | 5 +++--
 testbot/lib/ObjectModel/Item.pm       | 3 +--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/testbot/lib/ObjectModel/Collection.pm b/testbot/lib/ObjectModel/Collection.pm
index 0070c57..53ad5fe 100644
--- a/testbot/lib/ObjectModel/Collection.pm
+++ b/testbot/lib/ObjectModel/Collection.pm
@@ -404,7 +404,8 @@ sub Validate
       (my $ErrProperty, my $ErrMessage) = $Item->Validate();
       if (defined($ErrMessage))
       {
-        return ($Item->GetKey(), $ErrProperty, $ErrMessage);
+        return ($Item->GetKey(), $ErrProperty, "$ErrMessage for " .
+                $self->GetItemName() . " " . $Item->GetFullKey());
       }
       if ($Item->GetIsNew())
       {
@@ -424,7 +425,7 @@ sub Validate
           my $ExistingItem = $self->GetBackEnd()->LoadItem($self, $Item->GetKey());
           if (defined($ExistingItem))
           {
-            $ErrMessage = $self->GetItemName() . " " . $ErrMessage .
+            $ErrMessage = $self->GetItemName() . " " . $Item->GetFullKey() .
                           " already exists";
             return ($Item->GetKey(), undef, $ErrMessage);
           }
diff --git a/testbot/lib/ObjectModel/Item.pm b/testbot/lib/ObjectModel/Item.pm
index 0cc07ab..2ec69f1 100644
--- a/testbot/lib/ObjectModel/Item.pm
+++ b/testbot/lib/ObjectModel/Item.pm
@@ -382,8 +382,7 @@ sub Validate
       my ($ErrKey, $ErrProperty, $ErrMessage) = $Detail->Validate();
       if (defined($ErrMessage))
       {
-        return (undef, $ErrMessage . " for " . $Detail->GetItemName() .
-                       $ErrKey);
+        return (undef, $ErrMessage);
       }
     }
   }
-- 
2.0.0