Fix memory allocation issue when UT rawbank is empty
This MR should fix the memory allocation issue: https://lblogbook.cern.ch/HLT/1581
The problem was resolved by adding extra protection in the forward algorithm for empty UT rawbanks (bug identified by @dtou, many thanks!). This merge request adds additional protection to prevent similar issues from occurring in other algorithms.
I tested this with bu_307339_LHCb_ECEB01_BU_0.mep, but can't reproduce exactly same issue, would be good to test it with a test-stack in data-taking.
Edited by Jiahui Zhuo