Fix Redis get() calls in 05_crafting_data_for_llms

Removed .decode() calls since redis_client is configured with
decode_responses=True. Added None checks to handle missing data.

Author: abrookins

python-recipes/context-engineering/notebooks/section-4-optimizations/05_crafting_data_for_llms.ipynb

@@ -363,7 +363,7 @@
         "# Load and use the view\n",
         "print(\"\\nUsing the catalog view in an agent...\\n\")\n",
         "\n",
-        "catalog_view = redis_client.get(\"course_catalog_view\").decode('utf-8')\n",
+        "catalog_view = redis_client.get(\"course_catalog_view\") or \"\"\n",
         "\n",
         "system_prompt = f\"\"\"You are a class scheduling agent for Redis University.\n",
         "\n",
@@ -592,7 +592,8 @@
         "# Load and use the profile\n",
         "print(\"\\nUsing the profile view in an agent...\\n\")\n",
         "\n",
-        "profile_json = json.loads(redis_client.get(f\"user_profile:{user_data['student_id']}\").decode('utf-8'))\n",
+        "profile_data = redis_client.get(f\"user_profile:{user_data['student_id']}\")\n",
+        "profile_json = json.loads(profile_data) if profile_data else {}\n",
         "profile_text = profile_json['profile_text']\n",
         "\n",
         "system_prompt = f\"\"\"You are a class scheduling agent for Redis University.\n",