Bug Report - tar loader ignores empty files. An AI that requires such file fails to start

[SamuXarick]

Version of OpenTTD

OpenTTD 1.11.2 and Windows 10

Expected result

.tar loader shouldn't ignore empty files.

Actual result

.tar loader ignores an empty file which is required file for the AI to start without erroring out.

Steps to reproduce

The AI named Mungo, version 5 has an empty file, but it's required for the AI to start.
See conversation https://webster.openttdcoop.org/index.php?channel=openttd&date=1623369600#1623423363

[glx22]

Based on fileio.cpp history I think

OpenTTD/src/fileio.cpp

Line 545 in 7d79180

if (skip == 0) break;

can be removed. This check was used to detect folders or special stuff before we actually check entry type.