fix external info on mp3s with no ID3

app.py

@@ -220,8 +220,11 @@ def main(file, name, fps=30, res: tuple=(1280,720), oscres=512, sr=11025, lyrics
             cover_img = cover_file
         else:
             raise gr.Error("Mp3 must have a cover image, upload the image under the 'Metadata' section", duration=None)
-    elif cover_img == -1 and not (tit or ast):
-        raise gr.Error("Mp3 is missing tags, add the info under the 'Metadata' section", duration=None)
+    elif cover_img == -1 and not (tit or ast or img):
+        if img:
+            cover_img = cover_file
+        else:
+            raise gr.Error("Mp3 is missing tags, add the info under the 'Metadata' section", duration=None)
     
     title, artist = getTitleAndArtist(audio_path) 
     if title == '' or artist == '':