remove unused fragments from input during multiplexing

[mschwoer]

fixes

  File "/fs/gpfs41/lv07/fileset03/home/b_mann/eikmeier/miniforge3/envs/alphadia/lib/python3.10/site-packages/alphadia/libtransform/multiplex.py", line 79, in forward
    speclib = reduce(lambda x, y: apply_func(x, y), channel_lib_list)
  File "/fs/gpfs41/lv07/fileset03/home/b_mann/eikmeier/miniforge3/envs/alphadia/lib/python3.10/site-packages/alphadia/libtransform/multiplex.py", line 79, in <lambda>
    speclib = reduce(lambda x, y: apply_func(x, y), channel_lib_list)
  File "/fs/gpfs41/lv07/fileset03/home/b_mann/eikmeier/miniforge3/envs/alphadia/lib/python3.10/site-packages/alphadia/libtransform/multiplex.py", line 76, in apply_func
    x.append(y)
  File "/fs/gpfs41/lv07/fileset03/home/b_mann/eikmeier/miniforge3/envs/alphadia/lib/python3.10/site-packages/alphabase/spectral_library/base.py", line 281, in append
    raise ValueError(
ValueError: The libraries can't be appended as the number of fragments in the current libraries are not the same.

[GeorgWa]

Looks good!

[GeorgWa]

this should always be safe to call. I'm still a bit surprised it's needed.

[mschwoer]

hm, do you think it's worth digging a bit deeper? maybe this is just the symptomatic cure for a more severe bug?