implements feature #67 to have fallback topic name support #68
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for very simple pass-through kinds of streaming ETL pipelines from kafka to mongodb it is now possible to fallback to the name of the kafka topic which is taken as is to name the corresponding mongodb collection.
the behaviour is applied iff the "default" collection name is set to an empty string in the configuration
mongodb.collection=
whenever the sink connector doesn't find an explicit mapping for a kafka topic it then just uses the kafka topic name instead to fallback to the otherwise configured default mongodb collection name.
solves #67