Little cleanup for stub source (#7519)

* Little cleanup for stub source

Fixes instances where name shows up blank for stub sources

* Review Changes

Co-authored-by: Andreas <andreas.everos@gmail.com>

Co-authored-by: Andreas <andreas.everos@gmail.com>

app/src/main/java/eu/kanade/domain/source/model/SourceData.kt

@@ -4,4 +4,7 @@ data class SourceData(
     val id: Long,
     val lang: String,
     val name: String,
-)
+) {
+
+    val isMissingInfo: Boolean = name.isBlank() || lang.isBlank()
+}