React Warnings

[yankydoo]

I create this ticket to collect some React Warnings, where they occur and how to fix them. If time permits it, I'll create a PR with possible fixes as well.

Missing key:

• adminlte-2-react/src/components/content/SmartTable.tsx

  Lines 92 to 96 in 49d65f0

  	return columns
  	.filter((p) => hiddenColumns.find((p2) => p2 === p.data) === undefined)
  	.map((p) => (
  	<>
  	<SmartTableHeader