fix(ch06): guard against IndexError on empty LLM choices list

Nine example scripts in chapter 06 access choices[0] without checking
whether the API returned any choices. Content-policy filters, token
limits, and non-standard responses can all return choices=[].

- aoai-app.py, aoai-history-bot.py, aoai-study-buddy.py: wrap print in `if completion.choices`
- oai-app.py, oai-history-bot.py, oai-study-buddy.py: same
- githubmodels-app.py: wrap print in `if response.choices`
- aoai-app-recipe.py, oai-app-recipe.py: guard both choices accesses and
  skip the dependent shopping-list call when first response is empty

Author: qizwiz

06-text-generation-apps/python/aoai-app-recipe.py

@@ -69,16 +69,19 @@ def validate_text_input(value: str, max_length: int = 500) -> str:
 
 # print response
 print("Recipes:")
-print(completion.choices[0].message.content)
-
-old_prompt_result = completion.choices[0].message.content
-prompt_shopping = "Produce a shopping list, and please don't include ingredients that I already have at home: "
-
-new_prompt = f"Given ingredients at home {ingredients} and these generated recipes: {old_prompt_result}, {prompt_shopping}"
-messages = [{"role": "user", "content": new_prompt}]
-completion = client.chat.completions.create(model=deployment, messages=messages, max_tokens=600, temperature=0)
-
-# print response
-print("\n=====Shopping list ======= \n")
-print(completion.choices[0].message.content)
+if not completion.choices:
+    print("No response received.")
+else:
+    old_prompt_result = completion.choices[0].message.content
+    print(old_prompt_result)
+
+    prompt_shopping = "Produce a shopping list, and please don't include ingredients that I already have at home: "
+    new_prompt = f"Given ingredients at home {ingredients} and these generated recipes: {old_prompt_result}, {prompt_shopping}"
+    messages = [{"role": "user", "content": new_prompt}]
+    completion = client.chat.completions.create(model=deployment, messages=messages, max_tokens=600, temperature=0)
+
+    # print response
+    print("\n=====Shopping list ======= \n")
+    if completion.choices:
+        print(completion.choices[0].message.content)
 

06-text-generation-apps/python/aoai-app.py

@@ -23,7 +23,8 @@
 completion = client.chat.completions.create(model=deployment, messages=messages)
 
 # print response
-print(completion.choices[0].message.content)
+if completion.choices:
+    print(completion.choices[0].message.content)
 
 #  very unhappy _____.
 

06-text-generation-apps/python/aoai-history-bot.py

@@ -29,7 +29,8 @@
 completion = client.chat.completions.create(model=deployment, messages=messages, temperature=0)
 
 # print response
-print(completion.choices[0].message.content)
+if completion.choices:
+    print(completion.choices[0].message.content)
 
 #  very unhappy _____.
 

06-text-generation-apps/python/aoai-study-buddy.py

@@ -32,7 +32,8 @@
 completion = client.chat.completions.create(model=deployment, messages=messages)
 
 # print response
-print(completion.choices[0].message.content)
+if completion.choices:
+    print(completion.choices[0].message.content)
 
 #  very unhappy _____.
 

06-text-generation-apps/python/githubmodels-app.py

@@ -33,4 +33,5 @@
     top_p=1.    
 )
 
-print(response.choices[0].message.content)
+if response.choices:
+    print(response.choices[0].message.content)

06-text-generation-apps/python/oai-app-recipe.py

@@ -24,16 +24,19 @@
 
 # print response
 print("Recipes:")
-print(completion.choices[0].message.content)
-
-old_prompt_result = completion.choices[0].message.content
-prompt_shopping = "Produce a shopping list, and please don't include ingredients that I already have at home: "
-
-new_prompt = f"Given ingredients at home {ingredients} and these generated recipes: {old_prompt_result}, {prompt_shopping}"
-messages = [{"role": "user", "content": new_prompt}]
-completion = client.chat.completions.create(model=deployment, messages=messages, max_tokens=600, temperature=0)
-
-# print response
-print("\n=====Shopping list ======= \n")
-print(completion.choices[0].message.content)
+if not completion.choices:
+    print("No response received.")
+else:
+    old_prompt_result = completion.choices[0].message.content
+    print(old_prompt_result)
+
+    prompt_shopping = "Produce a shopping list, and please don't include ingredients that I already have at home: "
+    new_prompt = f"Given ingredients at home {ingredients} and these generated recipes: {old_prompt_result}, {prompt_shopping}"
+    messages = [{"role": "user", "content": new_prompt}]
+    completion = client.chat.completions.create(model=deployment, messages=messages, max_tokens=600, temperature=0)
+
+    # print response
+    print("\n=====Shopping list ======= \n")
+    if completion.choices:
+        print(completion.choices[0].message.content)
 

06-text-generation-apps/python/oai-app.py

@@ -16,7 +16,8 @@
 completion = client.chat.completions.create(model=deployment, messages=messages)
 
 # print response
-print(completion.choices[0].message.content)
+if completion.choices:
+    print(completion.choices[0].message.content)
 
 #  very unhappy _____.
 

06-text-generation-apps/python/oai-history-bot.py

@@ -24,7 +24,8 @@
 completion = client.chat.completions.create(model=deployment, messages=messages, temperature=0)
 
 # print response
-print(completion.choices[0].message.content)
+if completion.choices:
+    print(completion.choices[0].message.content)
 
 #  very unhappy _____.
 

06-text-generation-apps/python/oai-study-buddy.py

@@ -27,7 +27,8 @@
 completion = client.chat.completions.create(model=deployment, messages=messages)
 
 # print response
-print(completion.choices[0].message.content)
+if completion.choices:
+    print(completion.choices[0].message.content)
 
 #  very unhappy _____.