Fix data paths in LPD notebook
The LPD correction notebook appears to have been broken for more than a year. While it applied the corrections, the summary notebook lacked the data preview plots. This MR fixes a few trivial data paths pointing to outdated locations. In addition, it applies a band-aid to cal_tools.metrology.positionFileList
to ignore empty data files, which occur regularly with LPD.
Review @calibration
FYI @jsztuk
@yousefh Please validate the correction quality of this notebook. If it does not suit FXE's needs, I will disable it until you can develop a better solution. Also, we can then delete significant amounts of automatically corrected LPD data.