FIX: raise error on attempt to transform along an axis with size 0
FIX: raise error on attempt to transform along an axis with size 0

rgommers/pywt,PyWavelets/pywt,rgommers/pywt,grlee77/pywt,grlee77/pywt,PyWavelets/pywt,rgommers/pywt,rgommers/pywt