nl_tokens: Return the specified iterable if the source iterable is empty
pl_tokens: function or ( other ) { return function ( <mask> ) { return __asyncGenerator ( this , arguments , function * ( ) { var e_28 , _a ; let hasYieldedItem = false ; try { for ( var source_1 = __asyncValues ( source ) , source_1_1 ; source_1_1 = yield __await ( source_1 . next ( ) ) , ! source_1_1 . done ; ) { const item = source_1_1 . value ; yield yield __await ( item ) ; hasYieldedItem = true ; } } catch ( e_28_1 ) { e_28 = { error : e_28_1 } ; } finally { try { if ( source_1_1 && ! source_1_1 . done && ( _a = source_1 . return ) ) yield __await ( _a . call ( source_1 ) ) ; } finally { if ( e_28 ) throw e_28 . error ; } } if ( ! hasYieldedItem ) { yield __await ( yield * __asyncDelegator ( __asyncValues ( other ) ) ) ; } } ) ; } ; }