community: Fix azure_openai.py (#24572)

In some lines its trying to read a key that do not exists yet. In this
cases I changed the direct access to dict.get() method


- [ x] **Lint and test**: Run `make format`, `make lint` and `make test`
from the root of the package(s) you've modified. See contribution
guidelines for more: https://python.langchain.com/docs/contributing/

libs/community/langchain_community/embeddings/azure_openai.py

@@ -65,10 +65,10 @@ class AzureOpenAIEmbeddings(OpenAIEmbeddings):
             or os.getenv("AZURE_OPENAI_API_KEY")
             or os.getenv("OPENAI_API_KEY")
         )
-        values["openai_api_base"] = values["openai_api_base"] or os.getenv(
+        values["openai_api_base"] = values.get("openai_api_base") or os.getenv(
             "OPENAI_API_BASE"
         )
-        values["openai_api_version"] = values["openai_api_version"] or os.getenv(
+        values["openai_api_version"] = values.get("openai_api_version") or os.getenv(
             "OPENAI_API_VERSION", default="2023-05-15"
         )
         values["openai_api_type"] = get_from_dict_or_env(