Revert "format to 'n/a' if no value is passed to the formatter"
Revert "format to 'n/a' if no value is passed to the formatter"

This reverts commit 17bcf50a6d27b0221ae56c6a060ea2e6f1d2f240.

sachgits/react-data-grid,yogesh-patel/react-data-grid,bor3ham/react-data-grid,jeffvan576/react-data-grid,fayizk1/react-data-grid,nathanial/react-data-grid,somethingnew2-0/react-data-grid,kexplo/react-data-grid