[gnome-builder/gnome-builder-41] markedview: fix warning for NULL literal

[Christian Hergert <chergert src gnome org>]

commit e5b18b2f422f1f98172a062848257e754fd99dbc
Author: Christian Hergert <chergert redhat com>
Date:   Tue Dec 7 16:40:18 2021 -0800

    markedview: fix warning for NULL literal

 src/libide/gui/ide-marked-view.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/src/libide/gui/ide-marked-view.c b/src/libide/gui/ide-marked-view.c
index 2dbdfc6bc..9fd77346a 100644
--- a/src/libide/gui/ide-marked-view.c
+++ b/src/libide/gui/ide-marked-view.c
@@ -118,9 +118,15 @@ render_node(GString          *out,
     case CMARK_NODE_EMPH:
       if (entering)
         {
-          literal_escaped = g_markup_escape_text (cmark_node_get_literal (node), -1);
+          const char *literal = cmark_node_get_literal (node);
+
           g_string_append (out, "<i>");
-          g_string_append (out, literal_escaped);
+
+          if (literal)
+            {
+              literal_escaped = g_markup_escape_text (literal, -1);
+              g_string_append (out, literal_escaped);
+            }
         }
       if (!entering || node_is_leaf (node))
         {