Extensions Docs Server: Uniform handling of file not found errors

chrome/common/extensions/docs/server2/template_data_source.py

Index: chrome/common/extensions/docs/server2/template_data_source.py
diff --git a/chrome/common/extensions/docs/server2/template_data_source.py b/chrome/common/extensions/docs/server2/template_data_source.py
index dcd81c4ffcccf066cc75bcfb42ccf906eefb5e60..3c36b7151fc18a8d1b40af12789570718a66376b 100644
--- a/chrome/common/extensions/docs/server2/template_data_source.py
+++ b/chrome/common/extensions/docs/server2/template_data_source.py
@@ -5,6 +5,7 @@
 import logging
 
 from docs_server_utils import FormatKey
+from file_system import FileNotFoundError
 from third_party.handlebar import Handlebar
 
 EXTENSIONS_URL = '/chrome/extensions'
@@ -125,6 +126,6 @@ class TemplateDataSource(object):
     real_path = FormatKey(template_name)
     try:
       return self._cache.GetFromFile(base_path + '/' + real_path)
-    except Exception as e:
+    except FileNotFoundError as e:
       logging.error(e)
       return None