[fix] resulthunter: detect blocked requests instead of returning 0 results

searx/engines/resulthunter.py

@@ -10,6 +10,7 @@ from urllib.parse import urlencode
 from lxml import html
 
 from searx import locales
+from searx.exceptions import SearxEngineResponseException
 from searx.result_types import EngineResults
 from searx.utils import eval_xpath_list, eval_xpath, extract_text
 
@@ -112,6 +113,11 @@ def _image_results(doc: "ElementBase") -> EngineResults:
 def response(resp: "SXNG_Response") -> EngineResults:
     doc = html.fromstring(resp.text)
 
+    # if the request was wrong (e.g. missing params), the site doesn't contain a result container
+    # and instead shows an "Installation required" page to download the resulthunter browser extension
+    if not eval_xpath(doc, "//div[contains(@class, 'organic-results-container')]"):
+        raise SearxEngineResponseException()
+
     match resulthunter_categ:
         case "web":
             return _general_results(doc)