Handle if no module found for bots (#564)

Co-authored-by: Taranjeet Singh <reachtotj@gmail.com>

embedchain/bots/poe.py

@@ -3,12 +3,17 @@ import logging
 import os
 from typing import List, Optional
 
-from fastapi_poe import PoeBot, run
-
 from embedchain.helper.json_serializable import register_deserializable
 
 from .base import BaseBot
 
+try:
+    from fastapi_poe import PoeBot, run
+except ModuleNotFoundError:
+    raise ModuleNotFoundError(
+        "The required dependencies for Poe are not installed." 'Please install with `pip install "embedchain[poe]"`'
+    ) from None
+
 
 def start_command():
     parser = argparse.ArgumentParser(description="EmbedChain PoeBot command line interface")