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TimeSeries.read falls over when reading 'all' data from a cache file

It turns out TimeSeries.read can't handle being given a cache file and not being told the time boundaries over which to read:

$ cat H-H1_GWOSC_4KHZ_R1-1268903496-32.lcf
H H1_GWOSC_4KHZ_R1 1268903496 32 file://localhost/home/duncan/tmp/H-H1_GWOSC_4KHZ_R1-1268903496-32.gwf
from gwpy.timeseries import TimeSeries
print(TimeSeries.read("H-H1_GWOSC_4KHZ_R1-1268903496-32.lcf", "H1:GWOSC-4KHZ_R1_STRAIN"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/duncan/opt/mambaforge/envs/py311/lib/python3.11/site-packages/gwpy/timeseries/core.py", line 310, in read
    return timeseries_reader(cls, source, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/duncan/opt/mambaforge/envs/py311/lib/python3.11/site-packages/gwpy/timeseries/io/core.py", line 35, in read
    source = preformat_cache(source, *args[1:],
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/duncan/opt/mambaforge/envs/py311/lib/python3.11/site-packages/gwpy/timeseries/io/cache.py", line 55, in preformat_cache
    segment=Segment(start, end))
            ^^^^^^^^^^^^^^^^^^^
TypeError: '<=' not supported between instances of 'NoneType' and 'NoneType'