Fix thread naming error during fail-fast validation when connector name is null #195
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The connector thread naming pattern uses placeholders for ${connector.name} and ${task.id} which can be null during fail-fast validation on Confluent Cloud, causing the
error: "Cannot invoke 'java.lang.CharSequence.toString()' because 'replacement' is null".This PR adds proper null handling by using the topic prefix as a fallback when connector name is null, preventing the exception during connection validation without changing the intended naming behavior.