Clear previous RagGrid renders

[hollywoof]

See #65

Purpose of change

• FEATURE IMPLEMENTATION
• CODE QUALITY IMPROVEMENT
• BUG FIX

Description of change

Clear Html Element before adding a new grid

After accepting PR minimised grid js will need to be recreated

Version

Current

Reviewer

?

[codecov-commenter]

Codecov Report

Merging #66 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #66   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           2       2           
  Lines          67      61    -6     
======================================
+ Misses         67      61    -6     

Impacted Files	Coverage Δ
R/RagGrid.R	0.00% <0.00%> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 137

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 122:	0.0%
Covered Lines:	0
Relevant Lines:	61

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💛 - Coveralls

[hollywoof]

Closing this request = #68 contains further and better fixes