fixup logic

app.py

@@ -30,9 +30,11 @@ def run_model(video_id, outname, chunk_size):
     import os
     
     # check for marp command
-    if os.system("command -v marp >> /dev/null"):
+    if not os.system("command -v marp >> /dev/null"):
         print("Marp not found. Please install marp-cli.")
         os.system("sudo bash setup.sh")
+    else:
+        print("Marp found.")
     
     # Intermediary Markdown file
     print("Creating Markdown file...")