Fixed app crashing when loading thumbnail

app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt

@@ -20,7 +20,6 @@ package xyz.quaver.pupil.adapters
 
 import android.content.Context
 import android.graphics.drawable.Drawable
-import android.net.Uri
 import android.util.SparseBooleanArray
 import android.view.LayoutInflater
 import android.view.View
@@ -36,7 +35,6 @@ import com.daimajia.swipe.adapters.RecyclerSwipeAdapter
 import com.daimajia.swipe.interfaces.SwipeAdapterInterface
 import com.github.piasy.biv.loader.ImageLoader
 import kotlinx.android.synthetic.main.item_galleryblock.view.*
-import kotlinx.android.synthetic.main.item_reader.view.*
 import kotlinx.coroutines.*
 import xyz.quaver.hitomi.getReader
 import xyz.quaver.io.util.getChild
@@ -158,7 +156,9 @@ class GalleryBlockAdapter(private val galleries: List<Int>) : RecyclerSwipeAdapt
                     })
                     ssiv?.recycle()
                     CoroutineScope(Dispatchers.IO).launch {
-                        showImage(cache.getThumbnail() ?: Uri.EMPTY)
+                        cache.getThumbnail().let { launch(Dispatchers.Main) {
+                            showImage(it)
+                        } }
                     }
                 }
 

app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt

@@ -122,6 +122,8 @@ class MainActivity :
 
         checkUpdate(this)
 
+
+
         initView()
     }
 

app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt

@@ -132,7 +132,7 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
     }
 
     @Suppress("BlockingMethodInNonBlockingContext")
-    suspend fun getThumbnail(): Uri? =
+    suspend fun getThumbnail(): Uri =
         findFile(".thumbnail")?.uri
             ?: getGalleryBlock()?.thumbnails?.firstOrNull()?.let { withContext(Dispatchers.IO) {
                 kotlin.runCatching {
@@ -144,7 +144,7 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
                 }.getOrNull()?.let { thumbnail -> kotlin.runCatching {
                     cacheFolder.getChild(".thumbnail").also { it.writeBytes(thumbnail) }
                 }.getOrNull()?.uri }
-            } }
+            } } ?: Uri.EMPTY
 
     suspend fun getReader(): Reader? {
         val mirrors = Preferences.get<String>("mirrors").let { if (it.isEmpty()) emptyList() else it.split('>') }