BIS-1390: If the value of server-public-information.afs-server.url is not set we do not display an AFS browser.

BIS-1390: Made the error that server-public-information.afs-server.url is not set appear only when this parameter is needed.

BIS-1371: Fixed exporting issue when there are several colored elements by replacing greedy regex with a lazy one.

BIS-1049: Fixing the exception, which occurs when exporting non text Json nodes (in the spreadsheet).

BIS-1366: Refactored error handling for pattern assignment. Added AbstractCommonEntityTest for testing functionalities common for Experiments, Samples and DataSets

BIS-1335: In exported ZIP, removed empty experiment folders, which contained no name (when provided).