Fails if LS_COLORS environment variable is not set

[eserte]

See subject. If there's no LS_COLORS then test suite fails starting with:

PERL_DL_NONLAZY=1 "/usr/perl5.20.1Dp/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t

#   Failed test 'use File::LsColor;'
#   at t/00-load.t line 6.
#     Tried to use 'File::LsColor'.
#     Error:  LS_COLORS variable not set! Nothing to do...
#  at t/00-load.t line 6.
# Compilation failed in require at t/00-load.t line 6.
# BEGIN failed--compilation aborted at t/00-load.t line 6.
# Looks like you failed 1 test of 1.
t/00-load.t .......... 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/1 subtests 
... (etc) ...