Add error message when general section is missing
Add error message when general section is missing

Fix #43
Fix #45

mathstuf/vdirsyncer,hobarrera/vdirsyncer,credativUK/vdirsyncer,untitaker/vdirsyncer,untitaker/vdirsyncer,untitaker/vdirsyncer,tribut/vdirsyncer,credativUK/vdirsyncer,mathstuf/vdirsyncer,tribut/vdirsyncer,hobarrera/vdirsyncer