Fixed empty cache issue caused by modified childnames inside the loop of _preload_dir function
Fixed the return of is_bundle, is_bundle_file, is_bundle_dir, is_bundleset, is_bundleset_file, and is_bundleset_dir, now it will return False instead of '' for the cases like ('' and not '')
_preload_dir
functionis_bundle
,is_bundle_file
,is_bundle_dir
,is_bundleset
,is_bundleset_file
, andis_bundleset_dir
, now it will returnFalse
instead of''
for the cases like('' and not '')