Merge branch 'fix-sticker-delete-crash' of github.com:M0Rf30/MPD into v0.24.x

Author: MaxKellermann

NEWS

@@ -1,4 +1,6 @@
 ver 0.24.15 (not yet released)
+* protocol
+  - fix crash on "sticker delete"
 * playlist
   - asx, rss, xspf: limit to 16 MB
   - cue: fix problem playing CUE tracks in music directory root

src/command/StickerCommands.cxx

@@ -84,7 +84,12 @@ class DomainHandler {
 			   ? sticker_database.Delete(sticker_type, uri)
 			   : sticker_database.DeleteValue(sticker_type, uri, name);
 		if (!ret) {
-			response.FmtError(ACK_ERROR_NO_EXIST, "no such sticker: {:?}", name);
+			if (name == nullptr)
+				response.FmtError(ACK_ERROR_NO_EXIST,
+						  "no stickers found: {:?}", uri);
+			else
+				response.FmtError(ACK_ERROR_NO_EXIST,
+						  "no such sticker: {:?}", name);
 			return CommandResult::ERROR;
 		}