MvpPresenter, Kotlin: how avoid check isViewAttached()

BaseMvpPresenterK.kt

package ru.whalemare.vkbirthday.mvp.presenter.base

import com.hannesdorfmann.mosby.mvp.MvpBasePresenter
import com.hannesdorfmann.mosby.mvp.MvpView

/**
 * @since 2017
 * @author Anton Vlasov - whalemare
 */
open class BaseMvpPresenterK<V : MvpView> : MvpBasePresenter<V>() {

    fun isActive(body: (v: V) -> Unit) {
        if (isViewAttached) {
            body(view!!)
        }
    }

}

NoteMakerPresenterImpl.kt

/**
 * @since 2017
 * @author Anton Vlasov - whalemare
 */
class NoteMakerPresenterImpl : BaseMvpPresenterK<NoteMakerView>(), NoteMakerPresenter {

    override fun onClickNoteView() {
        isActive { it.showKeyboard() }
    }

}