[I] [helping] The difference between String a = null and String a = "" in beanshell script [jmeter]

[via GitHub]

kaijie-yu opened a new issue, #6110:
URL: https://github.com/apache/jmeter/issues/6110

   ### Expected behavior
   
   The difference between String a = null and String a = "" in beanshell script.
   What information can I refer to to understand this issue?
   
   ### Actual behavior
   
   _No response_
   
   ### Steps to reproduce the problem
   
   when i use String a = ""; I get a result . A definite value can be obtained。
   
![image](https://github.com/apache/jmeter/assets/55130444/3e957c0d-7006-410e-b319-a102f71c61ee)。
   but i use String a = null; I can`t get a result. i get a void.
   
![image](https://github.com/apache/jmeter/assets/55130444/a956443d-7a4b-463f-8073-df541cb12293)
   
   ### JMeter Version
   
   5.5
   
   ### Java Version
   
   17
   
   ### OS Version
   
   windows version 11


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