Fraction32.IsInfinity and UFraction32.IsInifinity returns true for NaN fractions

[Timie]

UFraction32.IsInifity(new UFraction32(0,0)) and Fraction32.IsInifity(new Fraction32(0,0)) return both true even though the number is actually NaN. They should return false.

This is caused by the fact, that IsInfinity does not check whether numenator is not 0. See:

exiflibrary/ExifLibrary/MathEx.cs

Line 203 in 1e0f838

return (f.Denominator == 0);

and

exiflibrary/ExifLibrary/MathEx.cs

Line 854 in 1e0f838

return (f.Denominator == 0);