Allow ignoring profile errors when merging, message on empty profile

[Midnighter]

• fix Allow ignoring profile errors when merging #135
• description of feature/fix
• tests added/passed
• add an entry to the changelog

Too late to add further testing right now.

[codecov-commenter]

Codecov Report

Patch coverage: 45.18% and project coverage change: +2.32% 🎉

Comparison is base (98713de) 85.87% compared to head (3715353) 88.19%.

❗ Current head 3715353 differs from pull request most recent head 9cde5a0. Consider uploading reports for the commit 9cde5a0 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #136      +/-   ##
==========================================
+ Coverage   85.87%   88.19%   +2.32%     
==========================================
  Files         114      114              
  Lines        1791     1762      -29     
  Branches      325      303      -22     
==========================================
+ Hits         1538     1554      +16     
+ Misses        205      176      -29     
+ Partials       48       32      -16     

Files Changed	Coverage Δ
...rc/taxpasta/infrastructure/application/__init__.py	100.00% <ø> (ø)
src/taxpasta/infrastructure/cli/merge.py	61.34% <28.57%> (+8.74%)	⬆️
src/taxpasta/infrastructure/cli/standardise.py	47.88% <35.29%> (+15.59%)	⬆️
src/taxpasta/application/add_tax_info_command.py	41.86% <41.86%> (ø)
...axpasta/application/sample_handling_application.py	76.31% <57.89%> (ø)
src/taxpasta/application/__init__.py	100.00% <100.00%> (ø)
...rc/taxpasta/domain/model/tidy_observation_table.py	100.00% <100.00%> (ø)
...rc/taxpasta/domain/model/wide_observation_table.py	100.00% <100.00%> (ø)

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