Fix generating reports if no week given unix_week() cannot handle week being None but does so for year. It just assumes the current year in this case, although this only duplicates the initialisation of year with c_year in this context. week being None gives TypeError: unsupported operand type(s) for -: 'NoneType' and 'int' load_entries() handles the case with no week given, thus call it anyhow. This fix makes it possible to invoke scripts/getan-report with a year given but no week and seeing the expected result (data for a whole year) instead of a traceback.

{{ user }}, (KW {{ week }}, {{ year }})
{% for i in user -%}
=
{%- endfor -%}
==============
{% for proj in projects %}
# {{ proj.desc }}
{% for entry in proj.entries|sort(attribute='start') -%}
{{ entry.get_comment() }}
{% endfor -%}
# total time: {{ proj.get_total_duration()|human_time }}h
{% endfor %}
# total: {{ total_time|human_time }}h