fix(popover+tooltip): content not restored after hiding all popovers with 'bv::hide::popover' (#1323)
fix(popover+tooltip): content not restored after hiding all popovers with 'bv::hide::popover' (#1323)

Prevents popovers/tooltip from showing empty content when re-opened after emitting `bv::hide::popover/tooltip`

Closes issue: #1322
sschadwick/bootstrap-vue,sschadwick/bootstrap-vue,tmorehouse/bootstrap-vue,sschadwick/bootstrap-vue,bootstrap-vue/bootstrap-vue,bootstrap-vue/bootstrap-vue,tmorehouse/bootstrap-vue