salt: Salt unable to apply high state - ` ValueError: '' is not in list`

Description of Issue/Question

Salt unable to apply high state

Setup

(Please provide relevant configs and/or SLS files (Be sure to remove sensitive info).) install salt-master and minion from PPA on ubuntu 14.04

Steps to Reproduce Issue

(Include debug logs if possible and relevant.) Apply high state

# salt '*' state.highstate
salt-master:
    The minion function caused an exception: Traceback (most recent call last):
      File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 1161, in _thread_return
        return_data = func(*args, **kwargs)
      File "/usr/lib/python2.7/dist-packages/salt/modules/state.py", line 523, in highstate
        whitelist=kwargs.get('whitelist')
      File "/usr/lib/python2.7/dist-packages/salt/state.py", line 2934, in call_highstate
        self.load_dynamic(matches)
      File "/usr/lib/python2.7/dist-packages/salt/state.py", line 2482, in load_dynamic
        self.state.module_refresh()
      File "/usr/lib/python2.7/dist-packages/salt/state.py", line 746, in module_refresh
        self.load_modules()
      File "/usr/lib/python2.7/dist-packages/salt/state.py", line 709, in load_modules
        self.functions = salt.loader.minion_mods(self.opts, self.state_con)
      File "/usr/lib/python2.7/dist-packages/salt/loader.py", line 159, in minion_mods
        loaded_base_name=loaded_base_name)
      File "/usr/lib/python2.7/dist-packages/salt/loader.py", line 738, in __init__
        self.refresh_file_mapping()
      File "/usr/lib/python2.7/dist-packages/salt/loader.py", line 858, in refresh_file_mapping
        if suffix_order.index(ext) < suffix_order.index(curr_ext):
    ValueError: '' is not in list

Versions Report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)

# salt-minion --versions-report
                  Salt: 2015.5.3
                Python: 2.7.6 (default, Jun 22 2015, 17:58:13)
                Jinja2: 2.7.2
              M2Crypto: 0.21.1
        msgpack-python: 0.3.0
          msgpack-pure: Not Installed
              pycrypto: 2.6.1
               libnacl: Not Installed
                PyYAML: 3.10
                 ioflo: Not Installed
                 PyZMQ: 14.0.1
                  RAET: Not Installed
                   ZMQ: 4.0.4
                  Mako: Not Installed
               Tornado: Not Installed
 Debian source package: 2015.5.3+ds-1trusty1

# salt-master --versions-report
                  Salt: 2015.5.3
                Python: 2.7.6 (default, Jun 22 2015, 17:58:13)
                Jinja2: 2.7.2
              M2Crypto: 0.21.1
        msgpack-python: 0.3.0
          msgpack-pure: Not Installed
              pycrypto: 2.6.1
               libnacl: Not Installed
                PyYAML: 3.10
                 ioflo: Not Installed
                 PyZMQ: 14.0.1
                  RAET: Not Installed
                   ZMQ: 4.0.4
                  Mako: Not Installed
               Tornado: Not Installed
 Debian source package: 2015.5.3+ds-1trusty1