[epiphany/mcatanzaro/#691] history-manager: avoid critical when deleting URLs not tracked by sync

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c8b3f008242197b8d24b6e5d5c6b9a7b8d1c47e3
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Apr 29 16:39:45 2019 -0500

    history-manager: avoid critical when deleting URLs not tracked by sync
    
    Fixes #691

 lib/sync/ephy-history-manager.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
---
diff --git a/lib/sync/ephy-history-manager.c b/lib/sync/ephy-history-manager.c
index 31914357d..547ce40cf 100644
--- a/lib/sync/ephy-history-manager.c
+++ b/lib/sync/ephy-history-manager.c
@@ -91,9 +91,11 @@ url_visited_cb (EphyHistoryService *service,
 {
   EphyHistoryRecord *record;
 
-  record = ephy_history_record_new (url->sync_id, url->title, url->url, url->last_visit_time);
-  g_signal_emit_by_name (self, "synchronizable-modified", record, TRUE);
-  g_object_unref (record);
+  if (url->sync_id) {
+    record = ephy_history_record_new (url->sync_id, url->title, url->url, url->last_visit_time);
+    g_signal_emit_by_name (self, "synchronizable-modified", record, TRUE);
+    g_object_unref (record);
+  }
 }
 
 static void
@@ -103,9 +105,11 @@ url_deleted_cb (EphyHistoryService *service,
 {
   EphyHistoryRecord *record;
 
-  record = ephy_history_record_new (url->sync_id, url->title, url->url, url->last_visit_time);
-  g_signal_emit_by_name (self, "synchronizable-deleted", record);
-  g_object_unref (record);
+  if (url->sync_id) {
+    record = ephy_history_record_new (url->sync_id, url->title, url->url, url->last_visit_time);
+    g_signal_emit_by_name (self, "synchronizable-deleted", record);
+    g_object_unref (record);
+  }
 }
 
 static void