fix crash when svg file not found

src/rsvg.c

@@ -44,7 +44,7 @@ ztk_rsvg_load_svg (
     {
       ztk_error (
         "An error occurred parsing the SVG file at "
-        "%s: %s", abs_path);
+        "%s: %s", abs_path, err->message);
       g_object_unref (file);
       return NULL;
     }

tests/meson.build

@@ -48,4 +48,5 @@ if get_option('enable_rsvg')
   test ('rsvg_test', e,
     args: join_paths(
       meson.current_source_dir(), 'test.svg'))
+  test ('rsvg_test_invalid', e, args: 'invalid')
 endif

tests/rsvg.c

@@ -26,7 +26,16 @@ int main (
 {
   ZtkRsvgHandle * handle =
     ztk_rsvg_load_svg (argv[1]);
-  ztk_assert (handle);
+
+  if (strcmp (argv[1], "invalid"))
+    {
+      ztk_assert (handle);
+    }
+  else
+    {
+      ztk_assert (!handle);
+      return 0;
+    }
 
   int width =
     ztk_rsvg_get_width (handle);