Fix: fallback to api_key if azure_ad_token is empty (#24)

Co-authored-by: Chester Curme <[email protected]>

Author: Satya-Indukuri

libs/community/langchain_community/retrievers/azure_ai_search.py

@@ -169,9 +169,9 @@ def _headers(self) -> Dict[str, str]:
         headers = {
             "Content-Type": "application/json",
         }
-        if not self.azure_ad_token:
+        if self.azure_ad_token:
             headers["Authorization"] = f"Bearer {self.azure_ad_token}"
-        else:
+        elif self.api_key:
             headers["api-key"] = f"{self.api_key}"
         return headers