[nautilus] search-engine-tracker: don't use fts:match on empty search entry

[Alexandru-Ionut Pandelea <alexpandelea src gnome org>]

commit fd05b6f064a2a0beb60616ecb3fba898c3349a89
Author: Alexandru Pandelea <alexandru pandelea gmail com>
Date:   Sat May 13 18:18:55 2017 +0300

    search-engine-tracker: don't use fts:match on empty search entry
    
    If the search entry is empty and filtering for date or mime type is
    added, then the sparql query always returns nothing because of
    fts:match '""*'
    
    To get the expected search results don't use fts:match when the
    search text is empty.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782596

 src/nautilus-search-engine-tracker.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/nautilus-search-engine-tracker.c b/src/nautilus-search-engine-tracker.c
index 00d5a92..38126bb 100644
--- a/src/nautilus-search-engine-tracker.c
+++ b/src/nautilus-search-engine-tracker.c
@@ -328,9 +328,12 @@ nautilus_search_engine_tracker_start (NautilusSearchProvider *provider)
                            "  nfo:fileLastModified ?mtime;"
                            "  nfo:fileLastAccessed ?atime;"
                            "  tracker:available true;"
-                           "  nie:url ?url;");
+                           "  nie:url ?url");
 
-    g_string_append_printf (sparql, " fts:match '\"%s\"*'", search_text);
+    if (*search_text)
+    {
+        g_string_append_printf (sparql, "; fts:match '\"%s\"*'", search_text);
+    }
 
     if (mime_count > 0)
     {