Maintain source info in the database. (#6389)

* Maintain Source Info in database

* Review changes and cleanups

* Review changes 2

* Review Changes 3

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -1140,7 +1140,9 @@ class MangaController :
 
     private fun downloadChapters(chapters: List<ChapterItem>) {
         if (source is SourceManager.StubSource) {
-            activity?.toast(R.string.loader_not_implemented_error)
+            activity?.let {
+                it.toast(it.getString(R.string.source_not_installed, source?.toString().orEmpty()))
+            }
             return
         }
 

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoHeaderAdapter.kt

@@ -228,11 +228,7 @@ class MangaInfoHeaderAdapter(
          */
         private fun setMangaInfo() {
             // Update full title TextView.
-            binding.mangaFullTitle.text = if (manga.title.isBlank()) {
-                view.context.getString(R.string.unknown)
-            } else {
-                manga.title
-            }
+            binding.mangaFullTitle.text = manga.title.ifBlank { view.context.getString(R.string.unknown) }
 
             // Update author TextView.
             binding.mangaAuthor.text = if (manga.author.isNullOrBlank()) {
@@ -249,6 +245,8 @@ class MangaInfoHeaderAdapter(
             }
 
             // If manga source is known update source TextView.
+            binding.mangaMissingSourceIcon.isVisible = source is SourceManager.StubSource
+
             val mangaSource = source.toString()
             with(binding.mangaSource) {
                 val enabledLanguages = preferences.enabledLanguages().get()