Channel creation date not shown if epoch is 0

Discovered this when I joined channel on EFnet. The channel creation date is not printed because it is '0'.

Tested in 7.75 and 7.75.1434.

Code to replicate the issue:

Code

alias chan_creation_date_bug {

  .parseline -qit  : $+ $server 324 $me #example +nst
  ; This next line does not print anything in the status window.
  .parseline -qit  : $+ $server 329 $me #example 0

  .parseline -qit  : $+ $server 324 $me #channel +nst
  ; This prints "  #channel created on Wed Dec 31 19:00:01 1969 ".
  .parseline -qit  : $+ $server 329 $me #channel 1
}