Error for Convert subclasses with multiple tags if select_tag isn't implemented #1853
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Description
Closes #1632
For a converter that supports multiple tags but does not implement select tag, raise a RuntimeError (instead of a warning). Previously a warning was produced only for
Converter
subclasses (virtual subclasses produced RuntimeErrors). Now both real and virtual subclasses produce errors.Checklist:
pre-commit checks ran successfully
tests ran successfully
for a public change, added a towncrier news fragment
changes/<PR#>.<changetype>.rst
changes/<PR#>.feature.rst
: new featurechanges/<PR#>.bugfix.rst
: bug fixchanges/<PR#>.doc.rst
: documentation changechanges/<PR#>.removal.rst
: deprecation or removal of public APIchanges/<PR#>.general.rst
: infrastructure or miscellaneous changefor a public change, updated documentation
for any new features, unit tests were added