fixup logic

app.py

@@ -30,13 +30,11 @@ def run_model(video_id, outname, chunk_size):
     import os
     
     # check for marp command
-    print(os.system("command -v marp"))
-    if not os.system("command -v marp >> /dev/null"):
+    if os.system("command -v marp >> /dev/null") != 0:
         print("Marp not found. Please install marp-cli.")
         os.system("bash setup.sh")
     else:
         print("Marp found.")
-    print(os.system("command -v marp"))
     
     
     # Intermediary Markdown file