Fix import error handling for optional chromadb dependency using TYPE_CHECKING

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/knowledge/storage/knowledge_storage.py

@@ -6,6 +6,13 @@ import os
 import shutil
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
 
+if TYPE_CHECKING:
+    import chromadb
+    import chromadb.errors
+    from chromadb.api import ClientAPI
+    from chromadb.api.types import OneOrMany
+    from chromadb.config import Settings
+else:
     try:
         import chromadb
         import chromadb.errors

src/crewai/memory/storage/rag_storage.py

@@ -6,11 +6,19 @@ import shutil
 import uuid
 from typing import TYPE_CHECKING, Any, Dict, List, Optional
 
+if TYPE_CHECKING:
+    import chromadb
+    from chromadb.api import ClientAPI
+    from chromadb.config import Settings
+else:
     try:
         import chromadb
         from chromadb.api import ClientAPI
         from chromadb.config import Settings
     except ImportError:
+        chromadb = None
+        ClientAPI = None
+        Settings = None
         raise ImportError(
             "ChromaDB is not installed. Please install it with `pip install crewai[chromadb]`."
         )