Added empty input data error catching for PCA analysis.
Merge pull request #29 from thehyve/issues/117-PCA-empty-data-error-catching

Added empty input data error catching for PCA analysis.
Bugfix. Sloppy comma omission.

My bad.
Merge branch 'master' into features/SAN-193_LineGraph_refactor

Conflicts:
	web-app/Rscripts/LineGraph/LineGraphLoader.r