Merge pull request #12 from xonsh/emptysrc

fixes empty source

Author: gforsyth

bash_completion.py

@@ -294,7 +294,7 @@ def bash_completions(prefix, line, begidx, endidx, env=None, paths=None,
     lprefix : int
         Length of the prefix to be replaced in the completion.
     """
-    source = _get_bash_completions_source(paths) or set()
+    source = _get_bash_completions_source(paths) or ''
 
     if prefix.startswith('$'):  # do not complete env variables
         return set(), 0

news/emptysrc.rst

@@ -0,0 +1,14 @@
+**Added:** None
+
+**Changed:** None
+
+**Deprecated:** None
+
+**Removed:** None
+
+**Fixed:**
+
+* If there are no files to source, a ``set()`` will no longer be inserted
+  into the completion script.
+
+**Security:** None