Fix crash on updating trackers after reading with no network (closes #4207)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt

@@ -673,14 +673,18 @@ class ReaderPresenter(
                         // We want these to execute even if the presenter is destroyed and leaks
                         // for a while. The view can still be garbage collected.
                         async {
+                            runCatching {
                                 service.update(track)
                                 db.insertTrack(track).await()
                             }
+                        }
                     } else {
                         null
                     }
                 }
                 .awaitAll()
+                .filter { it.isFailure }
+                .forEach { it.exceptionOrNull()?.let { e -> Timber.w(e) } }
         }
     }