rocksdbjni: Possible NPE in RocksDB.setOptions #7869 (#7909)

Summary:
Fix for https://github.com/facebook/rocksdb/issues/7869

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7909

Reviewed By: akankshamahajan15

Differential Revision: D26181440

Pulled By: ajkr

fbshipit-source-id: f323aec9d91e177fa873599b99801b391cf094b1

java/src/main/java/org/rocksdb/RocksDB.java

@@ -3574,9 +3574,8 @@ public class RocksDB extends RocksObject {
       /* @Nullable */final ColumnFamilyHandle columnFamilyHandle,
       final MutableColumnFamilyOptions mutableColumnFamilyOptions)
       throws RocksDBException {
-    setOptions(nativeHandle_, columnFamilyHandle.nativeHandle_,
-        mutableColumnFamilyOptions.getKeys(),
-        mutableColumnFamilyOptions.getValues());
+    setOptions(nativeHandle_, columnFamilyHandle == null ? 0 : columnFamilyHandle.nativeHandle_,
+        mutableColumnFamilyOptions.getKeys(), mutableColumnFamilyOptions.getValues());
   }
 
   /**