Plotting CCDs without defined apertures breaks reduce.

[StuartLittlefair]

As raised by @vikdhillon in #123

Trying to plot all CCDs in reduce when a CCD has no defined apertures gives the error below

File "/usr/local/python-3.11.4/bin/reduce", line 8, in
sys.exit(reduce())
^^^^^^^^
File "/usr/local/python-3.11.4/lib/python3.11/site-packages/hipercam/scripts/reduce.py", line 715, in reduce
update_plots(
File "/usr/local/python-3.11.4/lib/python3.11/site-packages/hipercam/reduction.py", line 994, in update_plots
res = next(res for (this_cnam, res) in results if this_cnam == cnam)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
StopIteration

we should change this so the CCD data is plotted as requested, but no aperture is overlayed