Better error feedback. Closes #325

app/src/main/java/eu/kanade/tachiyomi/data/source/online/OnlineSource.kt

@@ -261,6 +261,9 @@ abstract class OnlineSource(context: Context) : Source {
             .newCall(pageListRequest(chapter))
             .asObservable()
             .map { response ->
+                if (!response.isSuccessful) {
+                    throw Exception("Webpage sent ${response.code()} code")
+                }
                 mutableListOf<Page>().apply {
                     pageListParse(response, this)
                     if (isEmpty()) {

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

@@ -222,7 +222,7 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>() {
     fun onChapterError(error: Throwable) {
         Timber.e(error, error.message)
         finish()
-        toast(R.string.page_list_error)
+        toast(error.message)
     }
 
     fun onChapterAppendError() {