search-engine-tracker: Don't try to parse NULL time strings

TrackerCursor returns NULL if it doesn't have information on the date.
https://gnome.pages.gitlab.gnome.org/tracker/docs/developer/method.SparqlCursor.get_string.html

We try to parse NULL as a date string. This is obviously wrong and
gets us a precondition failure warning, as it should.

So, if a string is NULL, just skip it.

Fixes https://gitlab.gnome.org/GNOME/nautilus/-/issues/2160

1 files changed, 23 insertions, 22 deletions

diff --git a/src/nautilus-search-engine-tracker.c b/src/nautilus-search-engine-tracker.c
index 51917216b..88bd376c2 100644
--- a/src/nautilus-search-engine-tracker.c
+++ b/src/nautilus-search-engine-tracker.c
@@ -181,7 +181,6 @@ cursor_callback (GObject      *object,
     const char *atime_str;
     const char *ctime_str;
     const gchar *snippet;
-    GDateTime *date;
     g_autoptr (GTimeZone) tz = g_time_zone_new_local ();
     gdouble rank, match;
     gboolean success;
@@ -232,35 +231,37 @@ cursor_callback (GObject      *object,
         }
     }
 
-    date = g_date_time_new_from_iso8601 (mtime_str, tz);
-    if (date != NULL)
+    if (mtime_str != NULL)
     {
+        g_autoptr (GDateTime) date = g_date_time_new_from_iso8601 (mtime_str, tz);
+
+        if (date == NULL)
+        {
+            g_warning ("unable to parse mtime: %s", mtime_str);
+        }
         nautilus_search_hit_set_modification_time (hit, date);
-        g_date_time_unref (date);
-    }
-    else
-    {
-        g_warning ("unable to parse mtime: %s", mtime_str);
     }
-    date = g_date_time_new_from_iso8601 (atime_str, tz);
-    if (date != NULL)
+
+    if (atime_str != NULL)
     {
+        g_autoptr (GDateTime) date = g_date_time_new_from_iso8601 (atime_str, tz);
+
+        if (date == NULL)
+        {
+            g_warning ("unable to parse atime: %s", atime_str);
+        }
         nautilus_search_hit_set_access_time (hit, date);
-        g_date_time_unref (date);
     }
-    else
-    {
-        g_warning ("unable to parse atime: %s", atime_str);
-    }
-    date = g_date_time_new_from_iso8601 (ctime_str, tz);
-    if (date != NULL)
+
+    if (ctime_str != NULL)
     {
+        g_autoptr (GDateTime) date = g_date_time_new_from_iso8601 (ctime_str, tz);
+
+        if (date == NULL)
+        {
+            g_warning ("unable to parse ctime: %s", ctime_str);
+        }
         nautilus_search_hit_set_creation_time (hit, date);
-        g_date_time_unref (date);
-    }
-    else
-    {
-        g_warning ("unable to parse ctime: %s", ctime_str);
     }
 
     g_queue_push_head (tracker->hits_pending, hit);