Protect against files without any test output

auto/stylize_as_junit.rb

@@ -97,7 +97,11 @@ class UnityToJUnit
       #use line[0] from the test output to get the test_file path and name
       test_file_str = lines[0].gsub("\\","/")
       test_file_str = test_file_str.split(":")
-      test_file = test_file_str[0] + ':' + test_file_str[1]
+      test_file = if (test_file_str.length < 2)
+        result_file
+      else
+        test_file_str[0] + ':' + test_file_str[1]
+      end
       result_output[:source][:path] = File.dirname(test_file)
       result_output[:source][:file] = File.basename(test_file)