message: [bugfix] get word_cloud to support complex metrics
diff: @@ -721,14 +721,13 @@ class WordCloudViz(BaseViz):
  def query_obj(self):
  d = super(WordCloudViz, self).query_obj()
  -
  - d['metrics'] = [self.form_data.get('metric')]
  d['groupby'] = [self.form_data.get('series')]
  return d
  def get_data(self, df):
  + fd = self.form_data
  # Ordering the columns
  - df = df[[self.form_data.get('series'), self.form_data.get('metric')]]
  + df = df[[fd.get('series'), self.metric_labels[0]]]
  # Labeling the columns for uniform json schema
  df.columns = ['text', 'size']
  return df.to_dict(orient='records')
  