sched_options not present in XER

[chehadekassouf]

There are cases when sched_options is not present in the XER and not all add_date are present in the PROJECT data.

for sched_options not present the system stops with this error:
KeyError from line 121 of file venv/Lib/site-packages/xerparser/src/xer.py
maybe if u can check if the sched_options is not present to have a default.

for the add_date are present the system stop with this error:
time data '' does not match format '%Y-%m-%d %H:%M' from line 39 of file venv/Lib/site-packages/xerparser/schemas/project.py
maybe if u can check if it is not present not to assign it or use a default date

Thanks