handle case when MutableArtifacts.toml doesn't have loader_dir_hash

src/Gtk.jl

@@ -91,11 +91,11 @@ function __init__()
  mutable_artifacts_toml = joinpath(dirname(@__DIR__), "MutableArtifacts.toml")
  loaders_cache_name = "gdk-pixbuf-loaders-cache"
  loaders_cache_hash = artifact_hash(loaders_cache_name, mutable_artifacts_toml)
+ loaders_dir_name = "gdk-pixbuf-loaders-dir"
+ loaders_dir_hash = artifact_hash(loaders_dir_name, mutable_artifacts_toml)
+
  if loaders_cache_hash === nothing
  if Librsvg_jll.is_available()
- loaders_dir_name = "gdk-pixbuf-loaders-dir"
- loaders_dir_hash = artifact_hash(loaders_dir_name, mutable_artifacts_toml)
-
  # Copy loaders into a directory
  loaders_dir_hash = create_artifact() do art_dir
  loaders_dir = mkdir(joinpath(art_dir,"loaders_dir"))
@@ -126,8 +126,6 @@ function __init__()
  return String(read(`$gpql`))
  end
  end
-
-
  end
  # Write cache out to file in new artifact
  loaders_cache_hash = create_artifact() do art_dir
@@ -144,7 +142,7 @@ function __init__()
 
  # Point gdk to our cached loaders
  ENV["GDK_PIXBUF_MODULE_FILE"] = joinpath(artifact_path(loaders_cache_hash), "loaders.cache")
- ENV["GDK_PIXBUF_MODULEDIR"] = Librsvg_jll.is_available() ?
+ ENV["GDK_PIXBUF_MODULEDIR"] = Librsvg_jll.is_available() && loaders_dir_hash !== nothing ?
  joinpath(artifact_path(loaders_dir_hash), "loaders_dir") :
  gdk_pixbuf_loaders_dir