check if all frames exist before IFD extraction

client/ayon_core/hosts/houdini/plugins/publish/extract_mantra_ifd.py

@@ -29,6 +29,18 @@ def process(self, instance):
  render_rop(ropnode)
 
  files = instance.data["frames"]
+ # Check if all frames exists.
+ # Frames can be nonexistent if user cancels the render.
+ missing_frames = [
+ frame
+ for frame in instance.data["frames"]
+ if not os.path.exists(
+ os.path.normpath(os.path.join(staging_dir, frame)))
+ ]
+ if missing_frames:
+ raise RuntimeError("Failed to complete Mantra ifd extraction. "
+ "Missing output files: {}".format(
+ missing_frames))
 
  if "representations" not in instance.data:
  instance.data["representations"] = []