PETLinear crashes when using the --save_pet_in_t1w_space option

[NicolasGensollen]

Running the pet-linear pipeline with the --save_pet_in_t1w_space option results in the following error on dev:

$ clinica run pet-linear ./bids/ ./caps 18FFDG pons -tsv subjects.tsv --save_pet_in_t1w_space
...
Traceback (most recent call last):
  File "/builds/miniconda/envs/clinica/lib/python3.11/site-packages/nipype/pipeline/plugins/multiproc.py", line 67, in run_node
    result["result"] = node.run(updatehash=updatehash)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builds/miniconda/envs/clinica/lib/python3.11/site-packages/nipype/pipeline/engine/nodes.py", line 497, in run
    self._get_hashval()
  File "/builds/miniconda/envs/clinica/lib/python3.11/site-packages/nipype/pipeline/engine/nodes.py", line 548, in _get_hashval
    self._get_inputs()
  File "/builds/miniconda/envs/clinica/lib/python3.11/site-packages/nipype/pipeline/engine/nodes.py", line 613, in _get_inputs
    output_value = outputs.trait_get()[output_name]
                   ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
KeyError: 't1w'

I believe this is due to the recent merge of #1355 where the connection with the clipping node isn't made properly in this specific case.
Will look into it...