Make React.Children maps null-safe

[greg-a-smith]

Description

As was found in #517, the following syntax:

    {condition && <Component />}

will pass null in the children array when the condition is false. It's unfortunate that it just simply isn't omitted (as the syntax would seem to indicate), but that's how it works. #517 is addressing TabGroup, but there are other components that should have similar protection added to be safe against null children. At a minimum, it looks like:

• FormRadioGroup
• SideNav
• SideNavList
• SideNavListItem
• BaseTree
• TreeHead
• TreeItem
• TreeRow
• TreeView

Those components are using React.Children, but there may be others doing a map on children a different way.

Versions

fundamental-react: 0.5.1
fiori-fundamentals: n/a