Changed the table layout in create_invoice

When there are no purchases or times, the app will display a error
message instead of an empty list
Merge pull request #204 from Useful-Innovation/changes

Changed the table layout in create_invoice
Fixed Footer
Revert "Fixed Footer"

This reverts commit b638d8128652b59a7ab9b3a41a51532edd40924d.
Fixed footer
Merge pull request #205 from Useful-Innovation/davids-fixes

Fixed Footer
fixed conflict