get_running_builds returns error due to missing array.

[jlakin]

In Jenkins-2.32.3, when running get_running_builds(), if an executor has no executeables, it removes the array and replaces it with a string "None", resulting in errors.

            for executor in info['executors']:
                executable = executor['currentExecutable']
                if executable and 'PlaceholderTask' not in executable.get('_class', ''):
                    executor_number = executor['number']
                    build_number = executable['number']
                    url = executable['url']
                    m = re.search(r'/job/([^/]+)/.*', urlparse(url).path)
                    job_name = m.group(1)
                    builds.append({'name': job_name,
                                   'number': build_number,
                                   'url': url,
                                   'node': node_name,
                                   'executor': executor_number})
        return builds

>>> info_master = server.get_node_info('(master)', depth=2)

As seen below, the currentExecutable key in the second executor (number: 1) is not an array, but rather a string "None", causing the build.append to fail and return an error.

>>> info_master['executors']
[{u'likelyStuck': False, u'number': 0, u'idle': False, u'currentWorkUnit': {}, u'progress': 92, u'currentExecutable': {u'_class': u'org.jenkinsci.plugins.workflow.support.steps.ExecutorStepExecution$PlaceholderTask$PlaceholderExecutable'}}, {u'likelyStuck': False, u'number': 1, u'idle': True, u'currentWorkUnit': None, u'progress': -1, u'currentExecutable': None}

ERROR:
>>> server.get_running_builds
<bound method Jenkins.get_running_builds of <jenkins.Jenkins object at 0x7f5965989c90>>
>>> server.get_running_builds90
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Jenkins' object has no attribute 'get_running_builds90'
>>> server.get_running_builds()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/jenkins/__init__.py", line 1151, in get_running_builds
    build_number = executable['number']
KeyError: 'number'
>>>