[gnome-builder] html preview: fix Python coding style

[Sébastien Lafargue <slafargue src gnome org>]

commit 86e6994d8d4450cfe675eb6ad94e483823719fd5
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Wed Mar 15 17:19:39 2017 +0100

    html preview: fix Python coding style

 .../html-preview/html_preview_plugin/__init__.py   |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plugins/html-preview/html_preview_plugin/__init__.py 
b/plugins/html-preview/html_preview_plugin/__init__.py
index 480ac31..d41402c 100644
--- a/plugins/html-preview/html_preview_plugin/__init__.py
+++ b/plugins/html-preview/html_preview_plugin/__init__.py
@@ -49,6 +49,7 @@ except ImportError:
 
 _ = Ide.gettext
 
+
 class HtmlPreviewData(GObject.Object, Ide.ApplicationAddin):
     MARKDOWN_CSS = None
     MARKED_JS = None
@@ -137,6 +138,7 @@ class HtmlPreviewAddin(GObject.Object, Ide.EditorViewAddin):
         can_preview_rst = True
         self.workbench.pop_message('org.gnome.builder.docutils.install')
 
+
 class HtmlPreviewView(Ide.LayoutView):
     markdown = False
     rst = False