MNS: Show message on error (#3516)

* message

* check on all pages

src/es/mangasnosekai/build.gradle

@@ -3,7 +3,7 @@ ext {
     extClass = '.MangasNoSekai'
     themePkg = 'madara'
     baseUrl = 'https://mangasnosekai.com'
-    overrideVersionCode = 14
+    overrideVersionCode = 15
 }
 
 apply from: "$rootDir/common.gradle"

src/es/mangasnosekai/src/eu/kanade/tachiyomi/extension/es/mangasnosekai/MangasNoSekai.kt

@@ -231,6 +231,9 @@ class MangasNoSekai : Madara(
         do {
             val xhrRequest = altChapterRequest(url, mangaId, page, objects)
             val xhrResponse = client.newCall(xhrRequest).execute()
+            if (!xhrResponse.isSuccessful) {
+                throw Exception("HTTP ${xhrResponse.code}: Intente iniciar sesión en WebView")
+            }
             val xhrBody = xhrResponse.body.string()
             if (xhrBody.startsWith("{")) {
                 return chaptersFromJson(xhrBody, mangaSlug)