wolfstudy opened a new pull request #598:
URL: https://github.com/apache/pulsar-client-go/pull/598


   Signed-off-by: xiaolongran <[email protected]>
   
   
   
   ### Motivation
   
   ```
   panic: runtime error: index out of range [1] with length 1
   
   goroutine 166288 [running]:
   
github.com/apache/pulsar-client-go/pulsar.(*producer).internalCreatePartitionsProducers(0xc0070aa6e0,
 0x0, 0x0)
           
/Users/lzhuang/scfproj/scf_trigger_v2/vendor/github.com/apache/pulsar-client-go/pulsar/producer_impl.go:194
 +0x785
   
github.com/apache/pulsar-client-go/pulsar.(*producer).runBackgroundPartitionDiscovery.func1(0xc004167cd0,
 0xc00559f5c0, 0xc006af6dc0, 0xc0070aa6e0)
           
/Users/lzhuang/scfproj/scf_trigger_v2/vendor/github.com/apache/pulsar-client-go/pulsar/producer_impl.go:152
 +0xce
   created by 
github.com/apache/pulsar-client-go/pulsar.(*producer).runBackgroundPartitionDiscovery
           
/Users/lzhuang/scfproj/scf_trigger_v2/vendor/github.com/apache/pulsar-client-go/pulsar/producer_impl.go:144
 +0xcd
   ```
   
   ### Modifications
   
   indexing may panic because of 'nil' slice(oldProducers)
   
   


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