Merge remote-tracking branch 'origin/master'

# Conflicts:
#	modules/dnsquery/srv.py
#	modules/finder.py

common/lookup.py

@@ -23,6 +23,6 @@ class Lookup(Module):
         for item in answer:
             record = item.to_text()
             subdomains = self.match_subdomains(record)
-            self.subdomains = self.subdomains.union(subdomains)
+            self.subdomains.update(subdomains)
             logger.log('DEBUG', record)
         return self.subdomains

common/module.py

@@ -220,7 +220,8 @@ class Module(object):
 
     def collect_subdomains(self, resp):
         subdomains = self.match_subdomains(resp)
-        return self.subdomains.union(subdomains)
+        self.subdomains.update(subdomains)
+        return self.subdomains
 
     def save_json(self):
         """

common/utils.py

@@ -728,3 +728,13 @@ def match_subdomains(domain, html, distinct=True, fuzzy=True):
         return set(deal)
     else:
         return list(deal)
+
+
+def check_random_subdomain(subdomains):
+    if not subdomains:
+        logger.log('ALERT', f'The generated dictionary is empty')
+        return False
+    for subdomain in subdomains:
+        if subdomain:
+            logger.log('ALERT', f'Please check whether {subdomain} is correct or not')
+            return True