fixed: issue of not properly detecting the removal of the comfyui_manager package in a conda environment.

main.py

@@ -11,14 +11,15 @@ import itertools
 import utils.extra_config
 import logging
 import sys
+import importlib.util
 from comfy_execution.progress import get_progress_state
 from comfy_execution.utils import get_executing_context
 from comfy_api import feature_flags
 
 if not args.disable_manager:
-    try:
+    if importlib.util.find_spec("comfyui_manager"):
         import comfyui_manager
-    except Exception:
+    else:
         logging.warning(f"\n\nUnable to run comfyui-manager, disabling it. To enable comfyui-manager, run the following command:\ncommand:\n\t{sys.executable} -m pip install --pre comfyui_manager\n")
         args.disable_manager = True