Fixes nil NSString issue reported in #159

projects/XCode4/OCTest/OCTest/CatchOCTestCase.mm

@@ -74,4 +74,9 @@ OC_TEST_CASE( "OCTest/matchers", "Matches work with OC types (NSString so far)"
     REQUIRE_THAT( @"This is a string", EndsWith( @"string" ) );
 }
 
+OC_TEST_CASE( "OCTest/matchers/nil", "nil NSString should not crash the test" )
+{
+    REQUIRE_THAT( (NSString*)nil, Equals( @"This should fail, but not crash" ) );
+}
+
 @end