kinda fix for #246

Sources/EeveeSpotify/Lyrics/CustomLyrics.x.swift

@@ -26,7 +26,8 @@ class LyricsFullscreenViewControllerHook: ClassHook<UIViewController> {
         
         if UserDefaults.lyricsSource == .musixmatch 
             && lastLyricsError == nil
-            && !lastLyricsWasRomanized {
+            && !lastLyricsWasRomanized 
+            && !lastLyricsAreEmpty {
             return
         }
         
@@ -41,6 +42,7 @@ class LyricsFullscreenViewControllerHook: ClassHook<UIViewController> {
 //
 
 private var lastLyricsWasRomanized = false
+private var lastLyricsAreEmpty = false
 private var lastLyricsError: LyricsError? = nil
 
 private var hasShownRestrictedPopUp = false
@@ -212,6 +214,7 @@ func getCurrentTrackLyricsData(originalLyrics: Lyrics? = nil) throws -> Data {
     }
     
     lastLyricsWasRomanized = lyricsDto.romanized
+    lastLyricsAreEmpty = lyricsDto.lines.isEmpty
 
     let lyrics = Lyrics.with {
         $0.colors = getLyricsColors()

Sources/EeveeSpotify/Lyrics/Models/LyricsDto.swift

@@ -11,13 +11,26 @@ struct LyricsDto {
             $0.timeSynchronized = timeSynced
             $0.restriction = .unrestricted
             $0.providedBy = "\(source) (EeveeSpotify)"
-            $0.lines = lines.map { line in
+        }
+        
+        lyricsData.lines = lines.isEmpty 
+            ? [
+                LyricsLine.with {
+                    $0.content = "This song is instrumental."
+                },
+                LyricsLine.with {
+                    $0.content = "Let the music play..."
+                },
+                LyricsLine.with {
+                    $0.content = ""
+                }
+            ]
+            : lines.map { line in
                 LyricsLine.with {
                     $0.content = line.content
                     $0.offsetMs = Int32(line.offsetMs ?? 0)
                 }
             }
-        }
         
         if let translation = translation {
             lyricsData.translation = LyricsTranslation.with {

Sources/EeveeSpotify/Models/Headers/SPTPlayerTrack.swift

@@ -2,6 +2,7 @@ import Foundation
 
 @objc protocol SPTPlayerTrack {
     func setMetadata(_ metadata: [String:String])
+    func metadata() -> [String:String]
     func extractedColorHex() -> String
     func trackTitle() -> String
     func artistTitle() -> String