fix rescuing LoadError twice #33

Job	Run time
test (2.5, test/gemfiles/rails_5_0.gemfile)	2m 46s
test (2.5, test/gemfiles/rails_5_1.gemfile)	2m 59s
test (2.5, test/gemfiles/rails_5_2.gemfile)	2m 37s
test (2.5, test/gemfiles/rails_6_0.gemfile)	2m 41s
test (2.5, test/gemfiles/rails_6_1.gemfile)	2m 51s
test (2.6, test/gemfiles/rails_5_0.gemfile)	3m 0s
test (2.6, test/gemfiles/rails_5_1.gemfile)	2m 47s
test (2.6, test/gemfiles/rails_5_2.gemfile)	2m 48s
test (2.6, test/gemfiles/rails_6_0.gemfile)	2m 43s
test (2.6, test/gemfiles/rails_6_1.gemfile)	2m 40s
test (2.7, test/gemfiles/rails_5_0.gemfile)	2m 37s
test (2.7, test/gemfiles/rails_5_1.gemfile)	2m 33s
test (2.7, test/gemfiles/rails_5_2.gemfile)	2m 39s
test (2.7, test/gemfiles/rails_6_0.gemfile)	2m 48s
test (2.7, test/gemfiles/rails_6_1.gemfile)	2m 23s
test (2.7, test/gemfiles/rails_7_0_sassc.gemfile)	2m 35s
test (2.7, test/gemfiles/rails_7_0_dartsass.gemfile)	34s
test (3.0, test/gemfiles/rails_6_0.gemfile)	1m 30s
test (3.0, test/gemfiles/rails_6_1.gemfile)	1m 43s
test (3.0, test/gemfiles/rails_7_0_sassc.gemfile)	1m 15s
test (3.0, test/gemfiles/rails_7_0_dartsass.gemfile)	19s
test (3.1, test/gemfiles/rails_6_1.gemfile)	1m 31s
test (3.1, test/gemfiles/rails_7_0_sassc.gemfile)	1m 27s
test (3.1, test/gemfiles/rails_7_0_dartsass.gemfile)	18s
test (2.5, test/gemfiles/rails_4_2.gemfile)	2m 44s
test (2.6, test/gemfiles/rails_4_2.gemfile)	2m 44s
	57m 32s

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