text: Title: Crash report for output
  Body: ## Mycodo Issue Report:
    7.1.3
   
  #### Problem Description
  Please list:
  Hi All, run into this error for outputs set up, 
  After pressing: add output for atlas i2c pump signal crash error accrued. 
  Restart / did not solved it, pressing output in setup generate the same error 
  Any suggestions? many thanks!
  ### Errors
  
  ```
   Error 500: Internal Server Error
  Something bad happened but it's probably not your fault. Letting the developers know about these issues is crucial to supporting Mycodo. Please submit a new issue on GitHub with the following error traceback (copy the entire traceback):
  
  Error (Full Traceback):
  
  Traceback (most recent call last):
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/app.py", line 2292, in wsgi_app
      response = self.full_dispatch_request()
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/app.py", line 1815, in full_dispatch_request
      rv = self.handle_user_exception(e)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/app.py", line 1718, in handle_user_exception
      reraise(exc_type, exc_value, tb)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/_compat.py", line 35, in reraise
      raise value
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/app.py", line 1813, in full_dispatch_request
      rv = self.dispatch_request()
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/app.py", line 1799, in dispatch_request
      return self.view_functions[rule.endpoint](**req.view_args)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask_login/utils.py", line 261, in decorated_view
      return func(*args, **kwargs)
    File "/home/pi/Mycodo/mycodo/mycodo_flask/routes_page.py", line 1546, in page_output
      user=user)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/templating.py", line 135, in render_template
      context, ctx.app)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/flask/templating.py", line 117, in _render
      rv = template.render(context)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/jinja2/environment.py", line 1008, in render
      return self.environment.handle_exception(exc_info, True)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/jinja2/environment.py", line 780, in handle_exception
      reraise(exc_type, exc_value, tb)
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/jinja2/_compat.py", line 37, in reraise
      raise value.with_traceback(tb)
    File "/home/pi/Mycodo/mycodo/mycodo_flask/templates/pages/output.html", line 3, in top-level template code
      {% set help_page = ["output", dict_translation['output']['title']] %}
    File "/home/pi/Mycodo/mycodo/mycodo_flask/templates/layout.html", line 260, in top-level template code
      {%- block body %}{% endblock -%}
    File "/home/pi/Mycodo/mycodo/mycodo_flask/templates/pages/output.html", line 230, in block "body"
      {% include 'pages/output_options/'+each_output_template %}
    File "/home/pi/Mycodo/mycodo/mycodo_flask/templates/pages/output_options/atlas_ezo_pmp.html", line 4, in top-level template code
      {{form_mod_output.i2c_location.label(class_='control-label')}}
    File "/home/pi/Mycodo/env/lib/python3.5/site-packages/jinja2/environment.py", line 430, in getattr
      return getattr(obj, attribute)
  jinja2.exceptions.UndefinedError: 'mycodo.mycodo_flask.forms.forms_output.OutputMod object' has no attribute 'i2c_location'
  ```
  
  ### Steps to Reproduce the issue:
  How can this issue be reproduced?
   1. step 1
   2. step 2...
   3. etc
   
  ### Additional Notes
  Is there anything that should be added to make it easier
  to address this issue?