docs: private Map<String, List<String>> stripEmptyParams(Map<String, List<String>> parameters) {
          Builder<String, List<String>> paramsBuilder = ImmutableMap.<String, List<String>>builder();
          for (Map.Entry<String, List<String>> entry : parameters.entrySet()) {
              if(entry.getValue() != null && !entry.getValue().isEmpty()) {
                  paramsBuilder.put(entry.getKey(), entry.getValue());
              }
          }
          return paramsBuilder.build();
      }