Check that background field exists

src/freedombone-utils-gnusocialtools

@@ -165,7 +165,9 @@ function pleroma_set_background_image_from_url {
             chown www-data:www-data "static/bg_custom.${ext}"
             sed -i "s|\"background\":.*|\"background\": \"/static/bg_custom.${ext}\",|g" static/config.json
             if [ -f "$pleroma_secret" ]; then
-                sed -i "s|\"background\":.*|\"background\": \"/static/bg_custom.${ext}\",|g" "$pleroma_secret"
+                if grep -q "\"background\":" "$pleroma_secret"; then
+                    sed -i "s|\"background\":.*|\"background\": \"/static/bg_custom.${ext}\",|g" "$pleroma_secret"
+                fi
             fi
         fi
         if [ -d priv/static/static ]; then
@@ -173,7 +175,9 @@ function pleroma_set_background_image_from_url {
             chown www-data:www-data "priv/static/static/bg_custom.${ext}"
             sed -i "s|\"background\":.*|\"background\": \"/static/bg_custom.${ext}\",|g" priv/static/static/config.json
             if [ -f "$pleroma_secret" ]; then
-                sed -i "s|\"background\":.*|\"background\": \"/static/bg_custom.${ext}\",|g" "$pleroma_secret"
+                if grep -q "\"background\":" "$pleroma_secret"; then
+                    sed -i "s|\"background\":.*|\"background\": \"/static/bg_custom.${ext}\",|g" "$pleroma_secret"
+                fi
             fi
         fi