Update installer_base.lib.php to resolve bug report...

Update installer_base.lib.php to resolve bug report ispconfig/ispconfig3#5979
1 job for !1370 with ahrasis-develop-patch-27365 in 8 minutes and 3 seconds (queued for 2 seconds)
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Status Job ID Name Coverage
  Syntax
passed #9245
syntax:lint

00:08:03