title: Pyinstaller subprocess exception When running on windowed mode
body: <p>I'm using pyinstaller to create my application.In my django app, I'm using subprocess. When i execute pyinstaller in <code>noconsole</code> mode its throwing errors.
  Error log:</p>
  
  <pre><code>Traceback (most recent call last):
    File "site-packages\django\core\handlers\base.py", line 149, in get_response
    File "site-packages\django\core\handlers\base.py", line 147, in get_response
    File "crumbs_tableau\views.py", line 1603, in parser
    File "site-packages\django\shortcuts.py", line 67, in render
    File "site-packages\django\template\loader.py", line 96, in render_to_string
    File "site-packages\django\template\loader.py", line 43, in get_template
  django.template.exceptions.TemplateDoesNotExist: helpers/error.html
  Internal Server Error: /
  Traceback (most recent call last):
    File "crumbs_tableau\views.py", line 286, in parser
    File "crumbs_tableau\views.py", line 248, in mac_list
    File "subprocess.py", line 336, in check_output
    File "subprocess.py", line 403, in run
    File "subprocess.py", line 667, in __init__
    File "subprocess.py", line 905, in _get_handles
    File "subprocess.py", line 955, in _make_inheritable
  OSError: [WinError 6] The handle is invalid
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "site-packages\django\core\handlers\base.py", line 149, in get_response
    File "site-packages\django\core\handlers\base.py", line 147, in get_response
    File "crumbs_tableau\views.py", line 1603, in parser
    File "site-packages\django\shortcuts.py", line 67, in render
    File "site-packages\django\template\loader.py", line 96, in render_to_string
    File "site-packages\django\template\loader.py", line 43, in get_template
  django.template.exceptions.TemplateDoesNotExist: helpers/error.html
  Not Found: /static/parser/bootstrap.css.map
  </code></pre>