Object Storage NG: confusing behavior related to name filters

[majewsky]

While navigating through a deep folder structure in the Object Storage NG interface, we found two usability issues:

1. When using a name filter to find a directory and then navigating into that directory, the name filter remains in place. The subdirectory thus appears to contain less elements than it actually does (or even none). I would find it less surprising if the name filter was reset upon navigating to a different directory.

2. The main reason why this confused us longer than it should have is because a nonempty directory with a filter matching none of its entries displays the information message "This folder is empty", even though this is incorrect. This should read "No entries matching your filter" or something like that.

@SuperSandro2000 FYI