[servers/fat] fat_file_get_info: File '' not found

[perlun]

Sometimes, when trying to read a file using the fat server, you can get the error listed in the issue title. Does this really meant that the user was trying to read a file with an empty name? This sounds implausible. We should investigate this and see what the root cause is, and try to fix it so that the debugging experience is improved in this area.