Fix #690: Don't traceback when coverage reports fail.

Under Jython this step fails badly and tanks Nose.  Instead, emit a
warning about the failure to create the coverage reports, and move on.

2 files changed, 13 insertions, 2 deletions

diff --git a/CHANGELOG b/CHANGELOG
index ec09ab9..0c07e9f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -59,6 +59,8 @@ In Development
   Patch by Michael Dunn.
 - Fix #743: fix an incorrect regex in writing_tests.rst
   Patch by Anne Moroney.
+- Fix #690: Don't traceback when coverage reports fail.
+  Patch by John Szakmeister.
 
 1.3.0
 
diff --git a/nose/plugins/cover.py b/nose/plugins/cover.py
index 3cd390d..364d252 100644
--- a/nose/plugins/cover.py
+++ b/nose/plugins/cover.py
@@ -170,12 +170,21 @@ class Coverage(Plugin):
                     if self.wantModuleCoverage(name, module)]
         log.debug("Coverage report will cover modules: %s", modules)
         self.coverInstance.report(modules, file=stream)
+
+        import coverage
         if self.coverHtmlDir:
             log.debug("Generating HTML coverage report")
-            self.coverInstance.html_report(modules, self.coverHtmlDir)
+            try:
+                self.coverInstance.html_report(modules, self.coverHtmlDir)
+            except coverage.misc.CoverageException, e:
+                log.warning("Failed to generate HTML report: %s" % str(e))
+
         if self.coverXmlFile:
             log.debug("Generating XML coverage report")
-            self.coverInstance.xml_report(modules, self.coverXmlFile)
+            try:
+                self.coverInstance.xml_report(modules, self.coverXmlFile)
+            except coverage.misc.CoverageException, e:
+                log.warning("Failed to generate XML report: %s" % str(e))
 
         # make sure we have minimum required coverage
         if self.coverMinPercentage: