ftfy check (#189)

Signed-off-by: Kunjan patel <kunjanp@google.com>

Author: coolkp

src/maxdiffusion/pipelines/wan/wan_pipeline.py

@@ -32,14 +32,16 @@
 from maxdiffusion.video_processor import VideoProcessor
 from ...schedulers.scheduling_unipc_multistep_flax import FlaxUniPCMultistepScheduler, UniPCMultistepSchedulerState
 from transformers import AutoTokenizer, UMT5EncoderModel
-import ftfy
+from maxdiffusion.utils.import_utils import is_ftfy_available
 import html
 import re
 import torch
 
 
 def basic_clean(text):
-  text = ftfy.fix_text(text)
+  if is_ftfy_available():
+    import ftfy
+    text = ftfy.fix_text(text)
   text = html.unescape(html.unescape(text))
   return text.strip()