The config variables for WikispeechSpeechoidHaproxyQueueUrl and WikispeechSymbolSetUrl are required for listening and editing lexicon respectively. There should be a check that they are set. For WikispeechSpeechoidUrl this is done in ApiHooks:validateConfiguration.
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WikispeechSpeechoidHaproxyQueueUrl isn't needed. In fact it doesn't even seem to be used? You can still look up entries without WikispeechSymbolSetUrl, so maybe there should be an error on preview or save.