Closes #1769. Area chart will throw an error when less than two data points are available and display a message that says an area chart cannot be rendered with one data point
Merge branch 'master' into fix/#1769
changing the name of the error for area chart and removing consoling the error in favor of throwing the error
fixing syntax issues
adding tests and infrastructure for tests
Merge branch 'master' into fix/#1769
making vislib error message look and feel like the kibana no results message
Merge branch 'master' into fix/#1769
fixing handler unit tests for the error method
Merge branch 'master' into fix/#1769
Merge pull request #1963 from stormpython/fix/#1769

Area chart no longer empty by default.