Fixed initialization of charge and peak_time arrays

[moralejo]

Current version does not work for new (r0 ro dl1 stage in real data). This seems to fix it.

[codecov]

Codecov Report

Merging #483 into lstchain_ctapipe0.8 will not change coverage.
The diff coverage is 0.00%.

@@                 Coverage Diff                  @@
##           lstchain_ctapipe0.8     #483   +/-   ##
====================================================
  Coverage                42.04%   42.04%           
====================================================
  Files                       76       76           
  Lines                     6288     6288           
====================================================
  Hits                      2644     2644           
  Misses                    3644     3644           

Impacted Files	Coverage Δ
lstchain/calib/camera/calibrator.py	28.39% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 58588cb...92e6316. Read the comment docs.

[vuillaut]

Thanks for the quick fix. I don't understand how tests were passing before...