Analysis server fails to initialize/create contexts with an invalid entry in lint rules

[DanTup]

I had this in my analysis_options.yaml (note the blank entry at the end):

linter:
  rules:
    - camel_case_types
    - file_names
    - non_constant_identifier_names
    - comment_references
    -

It caused the server to fail to create analysis roots during initialization:

1714403559225:Ex:An error occurred while handling initialized notification
type 'Null' is not a subtype of type 'Object' in type cast
#0      YamlNodeExtension.valueOrThrow (package::analyzer/src/util/yaml.dart::147::36)
#1      _LintConfig.asString (package::analyzer/src/lint/config.dart::93::47)
#2      _LintConfig._parseYaml.<anonymous closure> (package::analyzer/src/lint/config.dart::136::29)
#3      _LinkedHashMapMixin.forEach (dart::collection-patch/compact_hash.dart::633::13)
#4      MapView.forEach (dart::collection/maps.dart::347::10)
#5      _LintConfig._parseYaml (package::analyzer/src/lint/config.dart::117::16)
#6      new LintConfig.parseMap (package::analyzer/src/lint/config.dart::38::62)
#7      parseConfig (package::analyzer/src/lint/config.dart::15::25)
#8      AnalysisOptionsImplExtensions.applyOptions (package::analyzer/src/analysis_options/apply_options.dart::229::18)
#9      ContextBuilderImpl._createOptionsMap (package::analyzer/src/dart/analysis/context_builder.dart::210::15)
#10     ContextBuilderImpl.createContext (package::analyzer/src/dart/analysis/context_builder.dart::135::15)
#11     new AnalysisContextCollectionImpl (package::analyzer/src/dart/analysis/analysis_context_collection.dart::104::36)
#12     ContextManagerImpl._createAnalysisContexts.performContextRebuildGuarded.performContextRebuild (package::analysis_server/src/context_manager.dart::547::40)
<asynchronous suspension>
#13     ContextManagerImpl._createAnalysisContexts.performContextRebuildGuarded (package::analysis_server/src/context_manager.dart::697::11)
<asynchronous suspension>
#14     _CancellingTaskQueue.queue.<anonymous closure> (package::analysis_server/src/context_manager.dart::981::15)
<asynchronous suspension>
#15     ContextManagerImpl.setRoots (package::analysis_server/src/context_manager.dart::363::5)
<asynchronous suspension>
#16     LspAnalysisServer._refreshAnalysisRoots (package::analysis_server/src/lsp/lsp_analysis_server.dart::1072::9)
<asynchronous suspension>
#17     LspAnalysisServer.updateWorkspaceFolders (package::analysis_server/src/lsp/lsp_analysis_server.dart::940::5)
<asynchronous suspension>

This seems like an error that should be non-fatal.