[gnome-software] trivial: allow dist'ing with no gnome-software installed

[Richard Hughes <rhughes src gnome org>]

commit aeacbd75881efc59d1b3d848609b2c062e079238
Author: Richard Hughes <richard hughsie com>
Date:   Tue Sep 5 11:52:08 2017 +0100

    trivial: allow dist'ing with no gnome-software installed
    
    Fixes:
    
        GLib-GIO-ERROR **: Settings schema 'org.gnome.software' does not contain a
        key named 'external-appstream-system-wide'

 plugins/flatpak/gs-self-test.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/plugins/flatpak/gs-self-test.c b/plugins/flatpak/gs-self-test.c
index 7090bf8..c8ad3d4 100644
--- a/plugins/flatpak/gs-self-test.c
+++ b/plugins/flatpak/gs-self-test.c
@@ -1480,6 +1480,10 @@ main (int argc, char **argv)
        g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
        g_setenv ("GS_SELF_TEST_FLATPAK_DATADIR", tmp_root, TRUE);
 
+       /* allow dist'ing with no gnome-software installed */
+       if (g_getenv ("GS_SELF_TEST_SKIP_ALL") != NULL)
+               return 0;
+
        /* ensure test root does not exist */
        if (g_file_test (tmp_root, G_FILE_TEST_EXISTS)) {
                ret = gs_utils_rmtree (tmp_root, &error);