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java.lang.NullPointerException: Cannot invoke "com.amazonaws.services.s3.AmazonS3.listObjectsV2(String)" because "s3Client" is null
	at com.convatec.filemgmt.service.FileMgmtService.bucketIsEmpty(FileMgmtService.java:148)
	at com.convatec.filemgmt.service.FileMgmtService.downloadFile(FileMgmtService.java:86)
	at com.convatec.filemgmt.service.FileMgmtServiceTest.testDownloadFile_BucketIsEmpty(FileMgmtServiceTest.java:123)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)