Beacon inotify problem

Description of Issue/Question

I am trying to set up beacon as in the example doc for

 inotify:
    - files:
        /etc/important_file:
          mask:
            - modify

and i keep getting this error on the salt-minion:

2018-07-21 13:25:23,094 [salt.minion      ][CRITICAL][24187] The beacon errored:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/salt/minion.py", line 2230, in handle_beacons
    beacons = self.process_beacons(self.functions)
  File "/usr/lib/python2.7/site-packages/salt/minion.py", line 409, in process_beacons
    return self.beacons.process(b_conf, self.opts['grains'])  # pylint: disable=no-member
  File "/usr/lib/python2.7/site-packages/salt/beacons/__init__.py", line 99, in process
    raw = self.beacons[fun_str](b_config[mod])
  File "/usr/lib/python2.7/site-packages/salt/beacons/inotify.py", line 261, in beacon
    if isinstance(config[path], dict):
TypeError: list indices must be integers, not dict

Setup

(Please provide relevant configs and/or SLS files (Be sure to remove sensitive info).)

[root]$ cat beacons.conf
beacons:
  load:
    - averages:
        1m:
          - 0.0
          - 2.0
        5m:
          - 0.1
          - 1.5
        15m:
          - 0.1
          - 1.0
    - emitatstartup: True
    - onchangeonly: False
    - interval: 60
  inotify:
    - files:
        /etc/important_file:
          mask:
            - modify

Steps to Reproduce Issue

(Include debug logs if possible and relevant.)

Versions Report

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

Salt Version:
           Salt: 2018.3.2

Dependency Versions:
           cffi: 1.9.1
       cherrypy: 3.2.2
       dateutil: 2.7.3
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.8
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: 0.21.1
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.8
   mysql-python: Not Installed
      pycparser: 2.17
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.5 (default, Nov  6 2016, 00:28:07)
   python-gnupg: Not Installed
         PyYAML: 3.12
          PyZMQ: 15.3.0
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: centos 7.2.1511 Core
         locale: UTF-8
        machine: x86_64
        release: 3.10.0-327.36.3.el7.x86_64
         system: Linux
        version: CentOS Linux 7.2.1511 Core

Reproduce the reported configuration from beacons.conf on the Salt 2018.3.2 setup, then start at salt/beacons/inotify.py around line 261 and trace how the inotify configuration is processed. Done means the supplied configuration no longer raises the TypeError and the beacon reports the expected file-change behavior.