Fix crash

java.lang.IllegalStateException: Fragment GalleryDetailScene{b6e25c2} (70626de1-16ff-47db-b4eb-e3358b5f53fc) not attached to a context.
        at androidx.fragment.app.Fragment.requireContext(Unknown Source:17)
        at androidx.fragment.app.Fragment.getResources(Unknown Source:0)
        at androidx.fragment.app.Fragment.getString(Unknown Source:0)
        at com.hippo.ehviewer.ui.scene.GalleryDetailScene.updateDownloadText(Unknown Source:93)
        at com.hippo.ehviewer.ui.scene.GalleryDetailScene.bindViewSecond(Unknown Source:68)
        at com.hippo.ehviewer.ui.scene.GalleryDetailScene$request$1.com.hippo.ehviewer.ui.scene.GalleryDetailScene.access$bindViewSecond(Unknown Source:131)
                                                             invokeSuspend
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(Unknown Source:8)
        at kotlinx.coroutines.DispatchedTask.run(Unknown Source:113)
        at kotlinx.coroutines.internal.LimitedDispatcher.run(Unknown Source:12)
        at kotlinx.coroutines.scheduling.TaskImpl.run(Unknown Source:2)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(Unknown Source:93)
                                                            kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask
                                                            kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker
                                                            run
        Suppressed: qs: [Is0{Cancelling}@bfcdc0e, Dispatchers.IO]

app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryDetailScene.kt

@@ -948,6 +948,7 @@ class GalleryDetailScene : BaseScene(), DownloadInfoListener {
 
     private fun bindViewSecond() {
         val gd = composeBindingGD ?: return
+        context ?: return
         if (mPage != 0) {
             Snackbar.make(
                 requireActivity().findViewById(R.id.snackbar),