settings: fix columns generation without configuration file (ticket #3490)

src/ncmpcpp.cpp

@@ -249,6 +249,8 @@ int main(int argc, char **argv)
 	Config.Read();
 	Key.Read();
 	
+	Config.GenerateColumns();
+	
 	if (getenv("MPD_HOST"))
 		Mpd.SetHostname(getenv("MPD_HOST"));
 	if (getenv("MPD_PORT"))

src/settings.cpp

@@ -1365,7 +1365,11 @@ void NcmpcppConfig::Read()
 		}
 	}
 	f.close();
+}
 
+void NcmpcppConfig::GenerateColumns()
+{
+	columns.clear();
 	std::string width;
 	while (!(width = GetLineValue(song_list_columns_format, '(', ')', 1)).empty())
 	{

src/settings.h

@@ -152,6 +152,7 @@ struct NcmpcppConfig
 	
 	void SetDefaults();
 	void Read();
+	void GenerateColumns();
 	
 	std::string ncmpcpp_directory;
 	std::string lyrics_directory;