Protect against early call of fences_get_fences_suggestion_info()

I'm seeing an error in one environment, which I can't reproduce locally, however I can see the following happening:

drush cc all

menu_get_active_theme() -> menu_get_item() -> entity load -> file_entity_load() -> token_replace() -> system_token_info() ->l() -> theme_get_registry() -> fences_get_fences_suggestion_info()

Should be possible to protect against the module_implements() cache not being right there by checking module_load_all(NULL) - same check as the theme registry does.