playlist/Print: throw PlaylistError::NoSuchList instead of returning false

src/playlist/Print.cxx

@@ -13,6 +13,7 @@
 #include "thread/Mutex.hxx"
 #include "Partition.hxx"
 #include "Instance.hxx"
+#include "PlaylistError.hxx"
 
 static void
 playlist_provider_print(Response &r,
@@ -48,7 +49,7 @@ playlist_provider_print(Response &r,
 	}
 }
 
-bool
+void
 playlist_file_print(Response &r, Partition &partition,
 		    const SongLoader &loader,
 		    const LocatedUri &uri,
@@ -68,9 +69,8 @@ playlist_file_print(Response &r, Partition &partition,
 #endif
 					  mutex);
 	if (playlist == nullptr)
-		return false;
+		throw PlaylistError::NoSuchList();
 
 	playlist_provider_print(r, loader, uri.canonical_uri, *playlist,
 				start_index, end_index, detail);
-	return true;
 }

src/playlist/Print.hxx

@@ -1,8 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 // Copyright The Music Player Daemon Project
 
-#ifndef MPD_PLAYLIST__PRINT_HXX
-#define MPD_PLAYLIST__PRINT_HXX
+#pragma once
 
 class Response;
 class SongLoader;
@@ -11,15 +10,14 @@ struct Partition;
 /**
  * Send the playlist file to the client.
  *
+ * Throws on error.
+ *
  * @param uri the URI of the playlist file in UTF-8 encoding
  * @param detail true if all details should be printed
- * @return true on success, false if the playlist does not exist
  */
-bool
+void
 playlist_file_print(Response &r, Partition &partition,
 		    const SongLoader &loader,
 		    const LocatedUri &uri,
-			unsigned start_index, unsigned end_index,
-			bool detail);
-
-#endif
+		    unsigned start_index, unsigned end_index,
+		    bool detail);