[gnome-software/gnome-3-24] trivial: Correctly clear custom widget CSS if the metadata key is cleared

[Richard Hughes <rhughes src gnome org>]

commit a8f07381a0db9bc338ebcfe0ca005feb5a6065ab
Author: Richard Hughes <richard hughsie com>
Date:   Thu May 4 16:03:36 2017 +0100

    trivial: Correctly clear custom widget CSS if the metadata key is cleared

 src/gs-common.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-common.c b/src/gs-common.c
index c0b59f8..1ec2afd 100644
--- a/src/gs-common.c
+++ b/src/gs-common.c
@@ -401,8 +401,10 @@ gs_utils_widget_set_css_app (GsApp *app,
 
        /* invalid */
        css = gs_app_get_metadata_item (app, metadata_css);
-       if (css == NULL)
+       if (css == NULL) {
+               gs_utils_widget_set_css_simple (widget, css);
                return;
+       }
 
        /* replace any key colors */
        css_str = g_string_new (css);