Remove empty string initializer. (#159)
The empty string caused the vector to have one element which caused the test at line 2041 to always fail.
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@ -1281,7 +1281,7 @@ namespace cxxopts
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}
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std::string
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help(const std::vector<std::string>& groups = {""}) const;
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help(const std::vector<std::string>& groups = {}) const;
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const std::vector<std::string>
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groups() const;
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