Improved error handling for individual data block fetches. Now a non-null error value returned from the data provider consistently results in filling that time period with 'errorFillValue'. Cache block merge is now cancelled if either block encountered a fetch error. Also added a new test for filling the error values in the combined result. WFSConnection now sets the 'strictErrorHandling' to false
Improved error handling for individual data block fetches. Now a non-null error value returned from the data provider consistently results in filling that time period with 'errorFillValue'. Cache block merge is now cancelled if either block encountered a fetch error. Also added a new test for filling the error values in the combined result. WFSConnection now sets the 'strictErrorHandling' to false
Fine-tuned the default time span length and the cache capacity