Ryota Suzuki b7cbec4d4b Fix print.xgb.Booster for R (#3338)
* Fix print.xgb.Booster

valid_handle should be TRUE when x$handle is NOT null

* Update xgb.Booster.R

Modify is.null.handle to return TRUE for NULL handle
2018-05-29 11:44:55 -07:00
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