[gtranslator] Set default required header if it doesn't exists

[Daniel Garcia Moreno <danigm src gnome org>]

commit 6c11c33e23ff7a77c79fb67e93b9c5dceca902e9
Author: Daniel García Moreno <danigm wadobo com>
Date:   Sun Jan 6 13:03:09 2019 +0100

    Set default required header if it doesn't exists
    
    Close #45

 src/gtr-header.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
diff --git a/src/gtr-header.c b/src/gtr-header.c
index b1953c72..42df65e9 100644
--- a/src/gtr-header.c
+++ b/src/gtr-header.c
@@ -184,6 +184,20 @@ gtr_header_class_init (GtrHeaderClass * klass)
   object_class->dispose = gtr_header_dispose;
 }
 
+static void
+gtr_header_set_defaults (GtrHeader *header)
+{
+  g_autofree gchar* mime_version = gtr_header_get_mime_version (header);
+  g_autofree gchar* prj_id_version = gtr_header_get_prj_id_version (header);
+
+  if (!mime_version || *mime_version == '\0')
+    gtr_header_set_mime_version (header, "1.0");
+  if (!prj_id_version || *prj_id_version == '\0')
+    gtr_header_set_prj_id_version (header, "0.1");
+
+}
+
+
 /* Public methods */
 
 /**
@@ -206,6 +220,8 @@ gtr_header_new (po_message_iterator_t iter, po_message_t message)
   /* We have to parse the number of plurals */
   parse_nplurals (header);
 
+  gtr_header_set_defaults (header);
+
   return header;
 }