[gegl] gegl:load fix crash on loading non-existing paths

[Øyvind Kolås <ok src gnome org>]

commit 90f4d1af13d884be330b8f8d74fbbbd07fdee46f
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Apr 17 00:44:40 2016 +0100

    gegl:load fix crash on loading non-existing paths

 operations/core/load.c        |   16 +++++++++++++---
 tests/simple/test-serialize.c |    3 +++
 2 files changed, 16 insertions(+), 3 deletions(-)
---
diff --git a/operations/core/load.c b/operations/core/load.c
index 3140ebf..60463f2 100644
--- a/operations/core/load.c
+++ b/operations/core/load.c
@@ -102,7 +102,9 @@ do_setup (GeglOperation *operation, const gchar *new_path, const gchar *new_uri)
 
       resolved_path = realpath (new_path, NULL);
 
-      if (!g_file_test (resolved_path, G_FILE_TEST_EXISTS))
+      if (resolved_path)
+      {
+        if (!g_file_test (resolved_path, G_FILE_TEST_EXISTS))
         {
           gchar *name = g_filename_display_name (resolved_path);
           gchar *tmp  = g_strdup_printf ("File '%s' does not exist", name);
@@ -116,7 +118,7 @@ do_setup (GeglOperation *operation, const gchar *new_path, const gchar *new_uri)
                          NULL);
           g_free (tmp);
         }
-      else
+        else
         {
           if (extension)
             handler = gegl_extension_handler_get_loader (extension);
@@ -127,7 +129,15 @@ do_setup (GeglOperation *operation, const gchar *new_path, const gchar *new_uri)
                          "path", resolved_path,
                          NULL);
         }
-      free (resolved_path);
+        free (resolved_path);
+      }
+      else
+      {
+        gegl_node_set (self->load,
+                       "operation", "gegl:text",
+                       "string",    "load failed",
+                       NULL);
+      }
     }
   else
     {
diff --git a/tests/simple/test-serialize.c b/tests/simple/test-serialize.c
index 6d5abd6..df3631a 100644
--- a/tests/simple/test-serialize.c
+++ b/tests/simple/test-serialize.c
@@ -55,7 +55,10 @@ TestCase tests[] = {
 #if 0
     {"over aux=[]",  " svg:src-over", "No such op 'gegl:['"},  /* should report error message */
 #endif
+    {"over aux=[ load path=/ ]",  " svg:src-over aux=[ gegl:load path='/' ]", ""},
     {"inver",           "", "No such op 'gegl:inver' suggestions: gegl:invert-gamma gegl:invert-linear"},
+
+    {"over aux=[ load path=/abc ]", " svg:src-over aux=[ gegl:load path='/abc' ]", ""},
     {NULL, NULL}
 };