Empty lines in the height file

From Paul Geoerg: if empty lines are in the height file, e.g. at the end, the file will not be imported

• Same problem in 3dc-file.
• height-file: code-marker to height
• Check if the internal id to aruco id file has the same problem

added bug medium labels

created branch 322-empty-lines-in-the-height-file to address this issue

mentioned in merge request !208 (merged)

mentioned in commit 4ecb17d4

closed with merge request !208 (merged)