fix bug for interrogate or caption

Provide support for /sdapi/v1/interrogate.Use API to get image caption

Author: Naylenv

webuiapi/webuiapi.py

@@ -153,6 +153,8 @@ def _to_api_result(self, response):
                 info = r['info']
         elif 'html_info' in r.keys():
             info = r['html_info']
+        elif 'caption' in r.keys():
+            info = r['caption']
 
         parameters = ''
         if 'parameters' in r.keys():