Ignore empty series in a query result instead of throwing an error

Author: Enric Sala

influxdb-client/QueryResult.m

@@ -50,8 +50,12 @@
  methods(Static)
  % Convert a response to objects
  function objs = from(response)
- assert(~isempty(response.results), 'the response contains no results');
- objs = arrayfun(@(x) QueryResult.wrap(x), response.results);
+ assert(~isempty(response.results), ...
+ 'from:empty', 'the response contains no results');
+ objs = arrayfun(@(x) QueryResult.wrap(x), ...
+ response.results, 'UniformOutput', false);
+ nonempty = cellfun(@(x) ~isempty(x), objs);
+ objs = cellfun(@(x) x, objs(nonempty));
  end
  end
 
@@ -61,9 +65,12 @@
  if isfield(result, 'error')
  error('query:error', 'query error: %s', result.error);
  end
- assert(isfield(result, 'series'), 'the result contains no series');
- series = arrayfun(@(x) SeriesResult.from(x), result.series);
- obj = QueryResult(series);
+ if isfield(result, 'series')
+ series = arrayfun(@(x) SeriesResult.from(x), result.series);
+ obj = QueryResult(series);
+ else
+ obj = [];
+ end
  end
 
  % Filter series by matching tags