[gnome-software] trivial: Do not refresh the details page if there is no current app set

[Richard Hughes <rhughes src gnome org>]

commit 7e83720d8514978b95eb890f52389a0b843f790f
Author: Richard Hughes <richard hughsie com>
Date:   Tue Mar 7 19:02:41 2017 +0000

    trivial: Do not refresh the details page if there is no current app set
    
    This is triggered when the network connection type changes.

 src/gs-details-page.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-details-page.c b/src/gs-details-page.c
index b599b1e..88de446 100644
--- a/src/gs-details-page.c
+++ b/src/gs-details-page.c
@@ -1192,6 +1192,10 @@ gs_details_page_refresh_reviews (GsDetailsPage *self)
                { GS_PLUGIN_ACTION_LAST,        NULL }
        };
 
+       /* nothing to show */
+       if (self->app == NULL)
+               return;
+
        /* show or hide the entire reviews section */
        switch (gs_app_get_kind (self->app)) {
        case AS_APP_KIND_DESKTOP: