[gnome-code-assistance] [backends/c] Ignore errors without location information

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 6623e5f14ff5e3da9be7c1018a1b348840e24c55
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Fri Nov 8 13:03:37 2013 +0100

    [backends/c] Ignore errors without location information

 backends/c/__init__.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/backends/c/__init__.py b/backends/c/__init__.py
index c79299c..4152cb7 100644
--- a/backends/c/__init__.py
+++ b/backends/c/__init__.py
@@ -98,6 +98,9 @@ class Document(transport.Document, transport.Diagnostics):
         return s.NONE
 
     def _map_csource_location(self, location):
+        if location.file is None:
+            return None
+
         if not os.path.samefile(self.path, location.file.name):
             return None