channelstream: don't try to communicate with ws server if not explictly enabled

rhodecode/model/comment.py

@@ -245,7 +245,7 b' class ChangesetCommentsModel(BaseModel):'
 
         registry = get_current_registry()
         rhodecode_plugins = getattr(registry, 'rhodecode_plugins', {})
-        channelstream_config = rhodecode_plugins.get('channelstream')
+        channelstream_config = rhodecode_plugins.get('channelstream', {})
         msg_url = ''
         if commit_obj:
             msg_url = commit_comment_url
@@ -254,7 +254,7 b' class ChangesetCommentsModel(BaseModel):'
             msg_url = pr_comment_url
             repo_name = pr_target_repo.repo_name
 
-        if channelstream_config:
+        if channelstream_config.get('enabled'):
             message = '<strong>{}</strong> {} - ' \
                       '<a onclick="window.location=\'{}\';' \
                       'window.location.reload()">' \
@@ -262,7 +262,6 b' class ChangesetCommentsModel(BaseModel):'
             message = message.format(
                 user.username, _('made a comment'), msg_url,
                 _('Refresh page'))
-            if channelstream_config:
                 channel = '/repo${}$/pr/{}'.format(
                     repo_name,
                     pull_request_id