[gnome-builder] flatpak: handle NULL parameters gracefully

[Christian Hergert <chergert src gnome org>]

commit fc76d452dd98d9631b61e0dd3913aaec2ef53500
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 17 20:14:19 2017 -0700

    flatpak: handle NULL parameters gracefully
    
    These can happen in various places where we read an id/branch/arch out of
    ancillary data and it is empty. In most places we use g_strcmp0() to be
    NULL-safe, to to simplify those code-paths, just handle NULL here.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782678

 plugins/flatpak/gbp-flatpak-application-addin.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/plugins/flatpak/gbp-flatpak-application-addin.c b/plugins/flatpak/gbp-flatpak-application-addin.c
index 9b326e5..51eeef4 100644
--- a/plugins/flatpak/gbp-flatpak-application-addin.c
+++ b/plugins/flatpak/gbp-flatpak-application-addin.c
@@ -711,10 +711,16 @@ gbp_flatpak_application_addin_has_runtime (GbpFlatpakApplicationAddin *self,
 
   IDE_ENTRY;
 
-  g_assert (GBP_IS_FLATPAK_APPLICATION_ADDIN (self));
-  g_assert (id != NULL);
-  g_assert (arch != NULL);
-  g_assert (branch != NULL);
+  g_return_val_if_fail (GBP_IS_FLATPAK_APPLICATION_ADDIN (self), FALSE);
+
+  if (id == NULL)
+    return FALSE;
+
+  if (arch == NULL)
+    arch = flatpak_get_default_arch ();
+
+  if (branch == NULL)
+    branch = "master";
 
   IDE_TRACE_MSG ("Looking for runtime %s/%s/%s", id, arch, branch);