Fix MangaTown endless search

app/src/main/java/org/koitharu/kotatsu/core/parser/site/ChanRepository.kt

@@ -23,7 +23,7 @@ abstract class ChanRepository(loaderContext: MangaLoaderContext) : RemoteMangaRe
 	): List<Manga> {
 		val domain = conf.getDomain(defaultDomain)
 		val url = when {
-			query != null -> {
+			!query.isNullOrEmpty() -> {
 				if (offset != 0) {
 					return emptyList()
 				}

app/src/main/java/org/koitharu/kotatsu/core/parser/site/MangaTownRepository.kt

@@ -37,7 +37,12 @@ class MangaTownRepository(loaderContext: MangaLoaderContext) : RemoteMangaReposi
 		}
 		val page = (offset / 30) + 1
 		val url = when {
-			!query.isNullOrEmpty() -> "$scheme://$domain/search?name=${query.urlEncoded()}"
+			!query.isNullOrEmpty() -> {
+				if (offset != 0) {
+					return emptyList()
+				}
+				"$scheme://$domain/search?name=${query.urlEncoded()}"
+			}
 			tag != null -> "$scheme://$domain/directory/${tag.key}/$page.htm$sortKey"
 			else -> "$scheme://$domain/directory/$page.htm$sortKey"
 		}