SDB REST Module does not work without a URI Query Parameter

Description of Issue/Question

REST SDB module cannot be used without specifying a request parameter. The documentation indicates that the SDB URI can be used without requiring any query parameters and the SDB REST configuration allows for configuration without a template variable. When attempting to retrieve the value without specifying a query parameter, the following error is given:

Exception occurred in runner sdb.get: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/salt/client/mixins.py", line 382, in _low
    data['return'] = self.functions[fun](*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/salt/runners/sdb.py", line 27, in get
    return salt.utils.sdb.sdb_get(uri, __opts__, __utils__)
  File "/usr/lib/python2.7/dist-packages/salt/utils/sdb.py", line 46, in sdb_get
    return loaded_db[fun](query, profile=profile)
  File "/usr/lib/python2.7/dist-packages/salt/sdb/rest.py", line 94, in get
    return query(key, None, service, profile)
  File "/usr/lib/python2.7/dist-packages/salt/sdb/rest.py", line 115, in query
    for pair in comps[1].split('&'):
IndexError: list index out of range

Looking at the code for '/salt/sdb/rest.py', the logic is such that it always assumes there is a value from performing the split('?') and does not perform any safety checks to ensure that it is not there:

'''
    Get a value from the REST interface
    '''
    comps = key.split('?')
    key = comps[0]
    key_vars = {}
    for pair in comps[1].split('&'):
        pair_key, pair_val = pair.split('=')
        key_vars[pair_key] = pair_val

In order to get the SDB value to return properly, you have to pass any arbitrary query string to the sdb URI in order for the value to return:

Assuming the SDB configuration in the Setup section below:
This does not work: salt-run sdb.get sdb://my-rest-api/urls
This works: salt-run sdb.get sdb://my-rest-api/urls?foo=bar

Setup

SDB Rest configuration from the rest example:

/etc/salt/master.d/sdb-github.sls

my-rest-api:
  driver: rest
  urls:
    url: https://api.github.com/
  keys:
    url: https://api.github.com/users/{{user}}/keys
    backend: requests

Steps to Reproduce Issue

1. Add the above SDB configuration to /etc/salt/master.d/github.sls
2. Execute the following Salt Run:

salt-run sdb.get sdb://my-rest-api/urls

Versions Report

Salt Version:
           Salt: 2017.7.2

Dependency Versions:
           cffi: Not Installed
       cherrypy: 3.5.0
       dateutil: 2.4.2
      docker-py: Not Installed
          gitdb: 0.6.4
      gitpython: 1.0.1
          ioflo: Not Installed
         Jinja2: 2.8
        libgit2: Not Installed
        libnacl: 1.6.1
       M2Crypto: Not Installed
           Mako: 1.0.3
   msgpack-pure: Not Installed
 msgpack-python: 0.4.6
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.12 (default, Nov 19 2016, 06:48:10)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.2.0
           RAET: Not Installed
          smmap: 0.9.0
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: Ubuntu 16.04 xenial
         locale: UTF-8
        machine: x86_64
        release: 4.4.0-87-generic
         system: Linux
        version: Ubuntu 16.04 xenial