[gitg] fix libgitg-date test package failure

[Alberto Fanjul <albfan src gnome org>]

commit b9f102c760adaee8185567007bcbe3b6604754f2
Author: Mahmoud Khalil <mahmoudkhalil11 gmail com>
Date:   Sun Oct 31 22:37:11 2021 +0200

    fix libgitg-date test package failure
    
    This commit fixes libgitg-date test package failure by checking on the
    values returned from the GLib.MatchInfo.fetch_named method if they
    were empty strings as well. According to the documentation here:
    https://docs.gtk.org/glib/method.MatchInfo.fetch_named.html
    the values returned from this method can be NULL values as well as
    empty strings

 libgitg/gitg-date.vala | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/libgitg/gitg-date.vala b/libgitg/gitg-date.vala
index 9e4e8010..efdb4fc7 100644
--- a/libgitg/gitg-date.vala
+++ b/libgitg/gitg-date.vala
@@ -140,7 +140,7 @@ public class Date : Object, Initable
        {
                string? val = info.fetch_named(name);
 
-               if (val == null)
+               if (val == null || val == "")
                {
                        return false;
                }
@@ -169,7 +169,7 @@ public class Date : Object, Initable
 
                string? tzs = info.fetch_named("tz");
 
-               if (tzs != null)
+               if (tzs != null && tzs != "")
                {
                        var ret = new DateTime.from_unix_utc(unixt);
                        return ret.to_timezone(new TimeZone(tzs));
@@ -200,7 +200,7 @@ public class Date : Object, Initable
 
                string? tzs = info.fetch_named("tz");
 
-               if (tzs != null)
+               if (tzs != null && tzs != "")
                {
                        tz = new TimeZone(tzs);
                }
@@ -247,7 +247,7 @@ public class Date : Object, Initable
 
                string? tzs = info.fetch_named("tz");
 
-               if (tzs != null)
+               if (tzs != null && tzs != "")
                {
                        tz = new TimeZone(tzs);
                }