Removed over-eager assertion.

Doesn't hold if reporting due to a segfault
#377

include/reporters/catch_reporter_bases.hpp

@@ -44,7 +44,6 @@ namespace Catch {
         }
         virtual void testCaseEnded( TestCaseStats const& /* _testCaseStats */ ) {
             currentTestCaseInfo.reset();
-            assert( m_sectionStack.empty() );
         }
         virtual void testGroupEnded( TestGroupStats const& /* _testGroupStats */ ) {
             currentGroupInfo.reset();