title: anaconda-navigator stuck on loading applications
body: <pre class="lang-none prettyprint-override"><code>$ anaconda-navigator 
  WARNING: The conda.compat module is deprecated and will be removed in a future release.
  /anaconda3/lib/python3.7/site-packages/anaconda_navigator/api/conda_api.py:1364: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
    data = yaml.load(f)
  2019-06-02 10:37:25,261 - ERROR download_api._get_url:416
  Expecting value: line 1 column 1 (char 0)
  
  Traceback (most recent call last):
    File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/widgets/main_window.py", line 539, in setup
  self.post_setup(conda_data=conda_data)
    File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/widgets/main_window.py", line 576, in post_setup
  self.tab_home.setup(conda_data)
    File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/widgets/tabs/home.py", line 169, in setup
  self.set_applications(applications, packages)
    File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/widgets/tabs/home.py", line 204, in set_applications
  apps = self.api.process_apps(applications, prefix=self.current_prefix)
    File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/api/anaconda_api.py", line 888, in process_apps
  versions=[vsdata.get('productVersion')],
  AttributeError: 'str' object has no attribute 'get'
  </code></pre>
  
  <p>I have seen this error posted in a few places but none of the sites give any viable solution.</p>
  
  <p>The applications work if launched directly though (so for now, I'm going with that)</p>
  
  <p>In case you need a detailed log, I have run the same command with --verbose and --debug options available here: <a href="https://drive.google.com/file/d/1Xump5Ns0FFX7N9Ujl0kqPZVNhXZgm4j1/view?usp=sharing" rel="nofollow noreferrer">https://drive.google.com/file/d/1Xump5Ns0FFX7N9Ujl0kqPZVNhXZgm4j1/view?usp=sharing</a> </p>