Since OpenACS timezone data is now newer as in many tcl versions, some time zones might not be available in tcl. Therefore, tcl-based conversions with these time zones will fail.
This change skips these timezones (on my system, 2 cases). But this is just a part of the fix. The "DB-based conversion" in "lc_time_tz_convert" seems to be broken for these cases as well, otherwise the regression test would not have stopped working.