fix: route not identified files to dead end edge

[ArzelaAscoIi]

Related Issues

• followup from feat: skip unknown file types [DC-1108] #7542

Proposed Changes:

• route not identified file to dead end.

How did you test it?

• not yet. First want to validate that this is feasible solution

Notes for the reviewer

• turned out that this does not work: feat: skip unknown file types [DC-1108] #7542 (comment).
  This results in:

Failed to index because of: 'Exception while running node 'FileTypeClassifier': 'NoneType' object has no attribute 'get'
Enable debug logging to see the data that was passed when the pipeline failed.'. Skipping handling indexing requests.

AttributeError: 'NoneType' object has no attribute 'get'
/opt/venv/lib/python3.10/site-packages/haystack/pipelines/base.py, line 567, run
/opt/venv/lib/python3.10/site-packages/haystack/pipelines/base.py, line 469, _run_node
/opt/venv/lib/python3.10/site-packages/haystack/nodes/base.py, line 201, _dispatch_run
/opt/venv/lib/python3.10/site-packages/haystack/nodes/base.py, line 257, _dispatch_run_general

Caused by:
Exception: Exception while running node 'FileTypeClassifier': 'NoneType' object has no attribute 'get'
Enable debug logging to see the data that was passed when the pipeline failed.
/opt/venv/lib/python3.10/site-packages/dc_consumer_indexing/indexing_service.py, line 79, handle_indexing_queue
/opt/venv/lib/python3.10/site-packages/dc_consumer_indexing/indexing_service.py, line 216, _batch_index_file
/opt/venv/lib/python3.10/site-packages/dc_consumer_indexing/gateways/haystack/local.py, line 170, batch_index
/opt/venv/lib/python3.10/site-packages/dc_consumer_indexing/gateways/haystack/local.py, line 90, _index
/opt/venv/lib/python3.10/site-packages/haystack/pipelines/base.py, line 574, run

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• I added unit tests and updated the docstrings
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• I ran pre-commit hooks and fixed any issue

[vblagoje]

Looks good @ArzelaAscoIi , let's wait for CI to complete