problem with validation of map backgrounds

https://scimap.lcsb.uni.lu/minerva/index.html?id=SCI_text_mining_layout&perfectMatch=false&modelId=26&backgroundId=0&x=7947&y=3207&z=3.198035684880173

changed milestone to %18.0.1

added BUG label

changed title from problem with validation of some maps to problem with validation of map backgrounds

created branch 311-problem-with-validation-of-map-backgrounds to address this issue

mentioned in merge request !281 (merged)

closed