Don't add empty songs into ToC

tape-playlist.lua

@@ -56,9 +56,10 @@ function()
                 for i = 1, 48 do
                     local offset = read32()
                     local length = read32()
-                    local title = drive.read(117)
+                    local title = drive.read(117):gsub("\x00", "")
+                    if length > 0 then
                         table.insert(table_of_contents, {
-                        title = length > 0 and title or nil,
+                            title = title,
                             offset = offset,
                             length = length,
                             ending = offset + length
@@ -67,6 +68,7 @@ function()
                 end
             end
         end
+    end
 end,
 function()
     local tape_was_present = nil