Release 0.5 breaks with some python recursivity problem

[lfrias81]

Whenever trying to run a tool or pipeline I get the following error:
Exception RuntimeError: 'maximum recursion depth exceeded while calling a Python object' in <type 'exceptions.AttributeError'> ignored

The same tool/pipelines runs ok in release 0.4

[lfrias81]

That though makes it not break (is a "warning"). What makes it break is not providing an optional parameter which is checked for whether is set or not, and the following error is got:

Traceback (most recent call last):
File "/apps/DEVEL/jip/2.7/0.5/bin/jip", line 9, in
load_entry_point('pyjip==0.5', 'console_scripts', 'jip')()
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/cli/jip_main.py", line 80, in main
_main()
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/cli/jip_main.py", line 137, in _main
runpy.run_module("jip.cli.jip_interpreter", run_name="main")
File "/apps/DEVEL/python/2.7.5/lib/python2.7/runpy.py", line 180, in run_module
fname, loader, pkg_name)
File "/apps/DEVEL/python/2.7.5/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/cli/jip_interpreter.py", line 63, in
main()
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/cli/jip_interpreter.py", line 59, in main
jip_run(jip_args + [script_file] + script_args)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/cli/jip_run.py", line 51, in main
dry(script, script_args, dry=args['--dry'], show=args['--show'])
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/cli/init.py", line 575, in dry
jobs = jip.jobs.create_jobs(script, args=script_args)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/jobs.py", line 1043, in create_jobs
pipeline.expand(validate=validate)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/pipelines.py", line 809, in expand
self._expand_sub_pipelines(validate=validate)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/pipelines.py", line 999, in _expand_sub_pipelines
_check_fanout=check_fanout)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/pipelines.py", line 809, in expand
self._expand_sub_pipelines(validate=validate)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/pipelines.py", line 977, in _expand_sub_pipelines
_render_nodes(self, [node])
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/pipelines.py", line 2165, in _render_nodes
_render_option(o, _create)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/pipelines.py", line 2201, in _render_option
rendered = option.value
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/options.py", line 402, in value
v = render_template(value, **ctx)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/templates.py", line 356, in render_template
return tmpl.render(**ctx)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jinja2/environment.py", line 969, in render
return self.environment.handle_exception(exc_info, True)
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jinja2/environment.py", line 742, in handle_exception
reraise(exc_type, exc_value, tb)
File "", line 3, in top-level template code
File "/apps/DEVEL/jip/2.7/0.5/lib/python/jip/tools.py", line 918, in str
if self.option.option_type != jip.options.TYPE_OPTION:
AttributeError: 'NoneType' object has no attribute 'option_type'