When reporting, don't fall over if there's no data to report on. Fixes issue #37.

1 files changed, 6 insertions, 2 deletions

diff --git a/coverage/control.py b/coverage/control.py
index e041cde7..4bcb4ed4 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -304,8 +304,12 @@ class coverage(object):
         """
         if outfile:
             outfile = open(outfile, "w")
-        reporter = XmlReporter(self, ignore_errors)
-        reporter.report(morfs, omit_prefixes=omit_prefixes, outfile=outfile)
+        try:
+            reporter = XmlReporter(self, ignore_errors)
+            reporter.report(
+                morfs, omit_prefixes=omit_prefixes, outfile=outfile)
+        finally:
+            outfile.close()
 
     def sysinfo(self):
         """Return a list of key,value pairs showing internal information."""