fix: Remove default values for azureSearchFilter and azureOpenAIStopSequence parameters

Author: Pavan-Microsoft

infra/main.parameters.json

@@ -45,7 +45,7 @@
       "value": "${AZURE_SEARCH_FILENAME_COLUMN=filename}"
     },
     "azureSearchFilter": {
-      "value": "${AZURE_SEARCH_FILTER=}"
+      "value": "${AZURE_SEARCH_FILTER}"
     },
     "azureSearchUrlColumn": {
       "value": "${AZURE_SEARCH_URL_COLUMN=url}"
@@ -156,7 +156,7 @@
       "value": "${AZURE_OPENAI_TOP_P=1}"
     },
     "azureOpenAIStopSequence": {
-      "value": "${AZURE_OPENAI_STOP_SEQUENCE=}"
+      "value": "${AZURE_OPENAI_STOP_SEQUENCE}"
     },
     "azureOpenAISystemMessage": {
       "value": "${AZURE_OPENAI_SYSTEM_MESSAGE=You are an AI assistant that helps people find information.}"

infra/main.waf.parameters.json

@@ -45,7 +45,7 @@
       "value": "${AZURE_SEARCH_FILENAME_COLUMN=filename}"
     },
     "azureSearchFilter": {
-      "value": "${AZURE_SEARCH_FILTER=}"
+      "value": "${AZURE_SEARCH_FILTER}"
     },
     "azureSearchUrlColumn": {
       "value": "${AZURE_SEARCH_URL_COLUMN=url}"