Seeing the following NPE in master when running rfile-info. Running accumulo
built from
caf75c15deffe1e0041d2242a350988a17641e58 with local changes from #675
```
$ accumulo rfile-info /accumulo/tables/3/t-000005l/A00000am.rf
Reading file: hdfs://localhost:8020/accumulo/tables/3/t-000005l/A00000am.rf
No on disk encryption detected.
RFile Version : 8
Locality group : <DEFAULT>
Num blocks : 2,172
Index level 0 : 68,056 bytes 1 blocks
First key : 73333378a7c00468 0921:707c [] 1538599801516
false
Last key : 79999982c534792e 78c2:67e0 [] 1538599767359
false
Num entries : 2,018,247
Column families : <UNKNOWN>
2018-10-03 17:06:31,101 [start.Main] ERROR: Thread 'rfile-info' died.
java.lang.NullPointerException
at com.beust.jcommander.JCommander.expandArgs(JCommander.java:430)
at com.beust.jcommander.JCommander.parse(JCommander.java:340)
at com.beust.jcommander.JCommander.parse(JCommander.java:319)
at org.apache.accumulo.core.cli.Help.parseArgs(Help.java:34)
at org.apache.accumulo.core.cli.ConfigOpts.parseArgs(ConfigOpts.java:93)
at
org.apache.accumulo.core.file.rfile.bcfile.PrintInfo.main(PrintInfo.java:73)
at
org.apache.accumulo.core.file.rfile.PrintInfo.execute(PrintInfo.java:187)
at org.apache.accumulo.start.Main.lambda$execKeyword$0(Main.java:129)
at java.lang.Thread.run(Thread.java:748)
```
[ Full content available at: https://github.com/apache/accumulo/issues/676 ]
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