Avoid loading available extensions list if it seems too small

(cherry picked from commit 6a39c8fc13)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -17,6 +17,7 @@ import eu.kanade.tachiyomi.extension.util.ExtensionLoader
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.util.lang.launchNow
+import eu.kanade.tachiyomi.util.system.logcat
 import eu.kanade.tachiyomi.util.system.toast
 import exh.log.xLogD
 import exh.source.BlacklistedSources
@@ -24,6 +25,7 @@ import exh.source.EH_SOURCE_ID
 import exh.source.EXH_SOURCE_ID
 import exh.source.MERGED_SOURCE_ID
 import kotlinx.coroutines.async
+import logcat.LogPriority
 import rx.Observable
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
@@ -198,7 +200,8 @@ class ExtensionManager(
             val extensions: List<Extension.Available> = try {
                 api.findExtensions()
             } catch (e: Exception) {
-                context.toast(e.message)
+                logcat(LogPriority.ERROR, e)
+                context.toast(R.string.extension_api_error)
                 emptyList()
             }
 

app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

@@ -23,20 +23,30 @@ internal class ExtensionGithubApi {
 
     suspend fun findExtensions(): List<Extension.Available> {
         return withIOContext {
-            networkService.client
+            val extensions = networkService.client
                 .newCall(GET("${REPO_URL_PREFIX}index.min.json"))
                 .await()
                 .parseAs<List<ExtensionJsonObject>>()
-                .toExtensions()
-        } /* SY --> */ + preferences.extensionRepos().get().flatMap { repoPath ->
-            val url = "$BASE_URL$repoPath/repo/"
-            networkService.client
-                .newCall(GET("${url}index.min.json"))
-                .await()
-                .parseAs<List<ExtensionJsonObject>>()
-                .toExtensions(url)
+                .toExtensions() /* SY --> */ + preferences.extensionRepos()
+                    .get()
+                    .flatMap { repoPath ->
+			            val url = "$BASE_URL$repoPath/repo/"
+			            networkService.client
+			                .newCall(GET("${url}index.min.json"))
+			                .await()
+			                .parseAs<List<ExtensionJsonObject>>()
+			                .toExtensions(url)
+			        }
+			        // SY <--
+
+            // Sanity check - a small number of extensions probably means something broke
+            // with the repo generator
+            if (extensions.size < 100) {
+                throw Exception()
+            }
+
+            extensions
         }
-        // SY <--
     }
 
     suspend fun checkForUpdates(context: Context): List<Extension.Installed> {