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Fixes simple error in _validate_clusterer #668

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  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)

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  • I have read the guidelines for contributing.
  • My code follows the code style of this project. I used flake8 to check my Python changes.
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have added tests to cover my changes.
  • All new and existing tests passed. I used pytest to check this on Python tests.

Function for checking if clusterer uses both precomputed affinity and metric (example:sklearn.cluster.AgglomerativeClustering) previously resulted in an error even when not using precomputed metric. This was because the list comprehension to check if there was a precomputed metric parameter resulted in a boolean list instead of a list of parameters set to "precomputed". This small change fixes that bug and ensures the expected behaviour.
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