develop branch: GPS information erroneously None

[chrstphrchvz]

As of ea5af10 the GPS information is not reported correctly.

Before:

$ EXIF.py /exif-samples/jpg/gps/DSCN0021.jpg
…
GPS GPSAltitudeRef (Byte): 0
GPS GPSDate (ASCII): 2008:10:23
GPS GPSImgDirectionRef (ASCII): 
GPS GPSLatitude (Ratio): [43, 28, 149399999/100000000]
GPS GPSLatitudeRef (ASCII): N
GPS GPSLongitude (Ratio): [11, 53, 433799999/100000000]
GPS GPSLongitudeRef (ASCII): E
GPS GPSMapDatum (ASCII): WGS-84   
GPS GPSSatellites (ASCII): 06
GPS GPSTimeStamp (Ratio): [14, 36, 4723/100]

After:

$ EXIF.py /exif-samples/jpg/gps/DSCN0021.jpg
…
GPS GPSAltitudeRef (Byte): 0
GPS GPSDate (ASCII): 2008:10:23
GPS GPSImgDirectionRef (ASCII): 
GPS GPSLatitude (Ratio): [None, None, None]
GPS GPSLatitudeRef (ASCII): N
GPS GPSLongitude (Ratio): [None, None, None]
GPS GPSLongitudeRef (ASCII): E
GPS GPSMapDatum (ASCII): WGS-84   
GPS GPSSatellites (ASCII): 06
GPS GPSTimeStamp (Ratio): [None, None, None]

Cc @cdusold (author of #72) in case of comment.

[chrstphrchvz]

I notice that exifread.Ratio() only returns anything when the denominator is 0, so maybe the issue is due to an extra indent on the return statement:

exif-py/exifread/utils.py

Lines 76 to 84 in b69af85

	# We're immutable, so use __new__ not __init__
	def __new__(cls, numerator=0, denominator=None):
	try:
	self = super(Ratio, cls).__new__(cls, numerator, denominator)
	except ZeroDivisionError:
	self = super(Ratio, cls).__new__(cls)
	self._numerator = numerator
	self._denominator = denominator
	return self

[cdusold]

Oops. That looks like it was the problem. Thanks, and sorry about that.