Revert "Only allow 'tls_insecure_set()' if cert is present (fixes #8329)"

This reverts commit 85ac50cc77.

homeassistant/components/mqtt/__init__.py

@@ -452,8 +452,8 @@ class MQTT(object):
                 certificate, certfile=client_cert,
                 keyfile=client_key, tls_version=tls_version)
 
-            if tls_insecure is not None:
-                self._mqttc.tls_insecure_set(tls_insecure)
+        if tls_insecure is not None:
+            self._mqttc.tls_insecure_set(tls_insecure)
 
         self._mqttc.on_subscribe = self._mqtt_on_subscribe
         self._mqttc.on_unsubscribe = self._mqtt_on_unsubscribe