importGems doesn't crash if gemOverrides not given
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@ -6,7 +6,7 @@
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expr = callPackage path {};
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ruby = config.ruby;
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rubyLibs = rubyLibsWith ruby;
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gems = rubyLibs.importGems expr.gemset config.gemOverrides;
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gems = rubyLibs.importGems gemset (config.gemOverrides or (gemset: {}));
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in {
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inherit ruby; # TODO: Set ruby using expr.rubyVersion if not given.
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gemPath = map (drv: "${drv}/${ruby.gemPath}") (
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