Update 2

app.py

@@ -253,7 +253,7 @@ def predict(model, text, melody_filepath, duration, dimension, topk, topp, tempe
         topp (float): Top-p sampling value.
         temperature (float): Sampling temperature.
         cfg_coef (float): Classifier-free guidance coefficient.
-        background (str): Path to background image.
+        background (str): Path to background image. default to "./assets/background.png".
         title (str): Song title.
         settings_font (str): Path to font file.
         settings_font_color (str): Font color for settings text.
@@ -279,6 +279,12 @@ def predict(model, text, melody_filepath, duration, dimension, topk, topp, tempe
     melody_name = "Not Used"
     melody_extension = "Not Used"
     melody = None
+    if melody_filepath in ["None", ""]:
+        melody_filepath = None
+
+    if background in ["None", ""]:
+        background = "./assets/background.png"
+
     if melody_filepath:
         melody_name, melody_extension = get_filename_from_filepath(melody_filepath)
         melody = get_melody(melody_filepath)