[gnome-shell] st/theme-node: Only try to parse non-empty inline styles

[Marge Bot <marge-bot src gnome org>]

commit f0a04719271e4b9d148362205c2379ef25f7c89b
Author: Sebastian Keller <skeller gnome org>
Date:   Fri Apr 29 23:30:21 2022 +0200

    st/theme-node: Only try to parse non-empty inline styles
    
    Otherwise cr_parser_new_from_buf() will fail creating a parser for a
    buffer of length 0, resulting in further errors due to the parser being
    NULL. This could happen when extensions were trying to set the style of
    a widget to an empty string.
    
    Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4634
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2286>

 src/st/st-theme-node.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/st/st-theme-node.c b/src/st/st-theme-node.c
index 13dbca88fd..6e09c3939a 100644
--- a/src/st/st-theme-node.c
+++ b/src/st/st-theme-node.c
@@ -456,7 +456,7 @@ ensure_properties (StThemeNode *node)
       if (node->theme)
         properties = _st_theme_get_matched_properties (node->theme, node);
 
-      if (node->inline_style)
+      if (node->inline_style && *node->inline_style != '\0')
         {
           CRDeclaration *cur_decl;