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It seems provided topic names in launch file does not match existing topic names:

provided in config topic: /laserscan_multi_merger/laserscan_topics: /sensor_1/points

existing topic: /sensor1/points

So "sensor_1" does not match "sensor1".

Based on module source code this module works only with sensor_msgs/LaserScan. Please make sure you are trying to merge laserscans but not point clouds.

The module makes validation of data types before subscription and existence of topics by provided names. It's not quite usual design in ros modules and allows this module to wait for correct topics silently (you don't see subscriptions in ros node info output).