Prevent fatal error with aggregate avg on empty group

[stloyd]

Change Log

Added

Fixed

• Prevent fatal error with aggregate avg on empty group

Changed

Removed

Deprecated

Security

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Description

Error:

PHP Fatal error:  Uncaught DivisionByZeroError: Division by zero in /Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/GroupBy/Aggregator/Average.php:49
Stack trace:
#0 /Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/GroupBy.php(101): Flow\ETL\GroupBy\Aggregator\Average->result()
#1 /Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/Pipeline/GroupByPipeline.php(62): Flow\ETL\GroupBy->result()
#2 /Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/DataFrame.php(582): Flow\ETL\Pipeline\GroupByPipeline->process(Object(Flow\ETL\FlowContext))
#3 /Users/stloyd/Documents/flow/examples/topics/aggregations/power_plant_bar_chart.php(56): Flow\ETL\DataFrame->run()
#4 /Users/stloyd/Documents/flow/examples/run_examples.php(47): include('/Users/stloyd/D...')
#5 {main}
  thrown in /Users/stloyd/Documents/flow/src/core/etl/src/Flow/ETL/GroupBy/Aggregator/Average.php on line 49