db/proxy: fall back to recursive walk on old libmpdclient/MPD

Error message was 'too few arguments for "find"' because the "base"
constraint was not supported, and no other constraints remained.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/SongFilter.hxx b/src/SongFilter.hxx
index b15127c07..8c46ed5f3 100644
--- a/src/SongFilter.hxx
+++ b/src/SongFilter.hxx
@@ -109,6 +109,11 @@ public:
 		return items;
 	}
 
+	gcc_pure
+	bool IsEmpty() const {
+		return items.empty();
+	}
+
 	/**
 	 * Is there at least one item with "fold case" enabled?
 	 */
@@ -122,6 +127,12 @@ public:
 	}
 
 	/**
+	 * Does this filter contain constraints other than "base"?
+	 */
+	gcc_pure
+	bool HasOtherThanBase() const;
+
+	/**
 	 * Returns the "base" specification (if there is one) or an
 	 * empty string.
 	 */