Spectra with gaps not plotted properly

[rweigel]

server     = 'http://hapi-server.org/servers-dev/TestData2.0/hapi'
dataset    = 'dataset1'
parameter  = 'spectra'
start      = '1970-01-01T00:00:01Z'
stop       = '1970-01-01T00:00:30Z'
opts       = {'logging': True, 'usecache': True}

data, meta = hapi(server, dataset, parameter, start, stop, **opts)

popts      = {'logging': True, 'returnimage': False, 'usecache': False}
hapiplot(data, meta, **popts)