wrap database save call in try/catch block, to mitigate metadata sync failure

bin/update-metadata.in

@@ -125,7 +125,12 @@ foreach my $id (keys %{$configuration->{federations}}) {
                 $entity->contacts(@contacts);
             }
             $entity->federations($id);
-            $entity->save();
+            eval {
+                $entity->save();
+            };
+            if ($EVAL_ERROR) {
+                warn "error while saving entity $entry->{entityid}: $EVAL_ERROR";
+            }
         }
 
     }