[qatl] api_tprojects, not raise ResponseException when dev_key it's invalid

[netzulo]

Description

• Must return code 200, or another thing? testlink XMLRPC problem
• Should recognize error structure and raise ResponseException to get working this testcase

    @pytest.skip(True, 'Issue oneped at qatestlink library, #52')
    @pytest.mark.raises(exception=ResponseException)
    def test_raises_tprojects_baddevkey(self):
        """TestCase: test_raises_tprojects_baddevkey"""
        tprojects = self.tlm.api_tprojects(dev_key='willfail')
        if len(tprojects) >= 0:
            raise AssertionError("Not empty Test Projects")

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <qatestlink.core.testlink_manager.TLManager object at 0x00000263FF1451D0>
dev_key = 'willfail'

    def api_tprojects(self, dev_key=None):
        """Call to method named 'tl.getProjects' for testlink XMLRPC

            Keyword Arguments:
                dev_key {str} -- string of developer key provided by Testlink
                    (default: {value obtained from JSON settings file})

            Returns:
                list(TProject) -- list of object model for Testlink Test Project
                    data
            """
        if not dev_key:
            dev_key = self._settings.get('dev_key')
        req_data = self._xml_manager.req_tprojects(dev_key)
        res = self._conn.post(self._xml_manager.headers, req_data)
        res_dict = self._xml_manager.parse_response(res)
        res_param = res_dict.get(
            'methodResponse')['params']['param']['value']
        data_list = res_param.get('array')['data']['value']
        tprojects = list()
        for data_properties in data_list:
>           properties = data_properties['struct']['member']
E           TypeError: string indices must be integers

c:\users\cronosadmin\envs\tltests\lib\site-packages\qatestlink-0.0.9-py3.6.egg\qatestlink\core\testlink_manager.py:107: TypeError
-------------------------- Captured stderr teardown ---------------------------
2018-07-05 23:16:51,833 - qatestlink - INFO - POST request:
2018-07-05 23:16:51,833 - qatestlink - DEBUG -     url=http://qalab.tk:86/lib/api/xmlrpc/v1/xmlrpc.php
2018-07-05 23:16:51,833 - qatestlink - DEBUG -     headers={'Content-Type': 'application/xml'}
2018-07-05 23:16:51,833 - qatestlink - DEBUG -     data=b'<?xml version="1.0" encoding="UTF-8" ?><methodCall><methodName>tl.getProjects</methodName><params><struct><name>devKey</name><value>willfail</value></struct></params></methodCall>'
2018-07-05 23:16:51,892 - qatestlink - INFO - POST response:
2018-07-05 23:16:51,892 - qatestlink - INFO -     status_code=200
2018-07-05 23:16:51,892 - qatestlink - DEBUG -     data=<?xml version="1.0"?>
<methodResponse>
  <params>
    <param>
      <value>
        <array><data>
  <value><struct>
  <member><name>code</name><value><int>2000</int></value></member>
  <member><name>message</name><value><string>Can not authenticate client: invalid developer key</string></value></member>
</struct></value>
</data></array>
      </value>
    </param>
  </params>
</methodResponse>