[gedit-plugins/translate] Switch to service only if key has been defined

[Jordi Mas <jmas src gnome org>]

commit e335c0f732a7a1f670e87bffadf8189f0216753f
Author: Jordi Mas <jmas softcatala org>
Date:   Sun Mar 4 21:45:09 2018 +0100

    Switch to service only if key has been defined

 plugins/translate/translate/preferences.py |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/plugins/translate/translate/preferences.py b/plugins/translate/translate/preferences.py
index 4686595..c44523d 100644
--- a/plugins/translate/translate/preferences.py
+++ b/plugins/translate/translate/preferences.py
@@ -153,11 +153,12 @@ class Preferences(object):
 
         item = model[index]
         self._service_id = item[1]
-        self._settings.set_service(self._service_id)
         service = Services.get(self._service_id)
         if service.has_api_key() is True:
             key = self._settings.get_apikey()
             service.set_api_key(key)
+        else:
+            self._settings.set_service(self._service_id)
 
         service.init()
         self._update_api_key_ui(service.has_api_key())
@@ -166,6 +167,11 @@ class Preferences(object):
     def _changed_apikey(self, text_entry):
         text = text_entry.get_text()
         self._settings.set_apikey(text)
+        if len(text) > 0:
+            self._settings.set_service(self._service_id)
+        else:
+            self._settings.set_service(Services.APERTIUM_ID)
+
 
     def _radio_samedoc_callback(self, widget, data=None):
         self._settings.set_output_document(widget.get_active())