do not parse empty default values and improve error messages
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@@ -618,7 +618,7 @@ For the described keys:
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# Bad call
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$ ./app -fps=aaa
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ERRORS:
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Exception: can not convert: [aaa] to [double]
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Parameter 'fps': can not convert: [aaa] to [double]
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@endcode
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*/
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class CV_EXPORTS CommandLineParser
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