How to reproduce

• Connect to the ametys explorer
• Select a file
• Click on "Metadatas"
• Insert keywords like : "image, insa, ametys, cms"
• Validate
• Click again on "Metadatas"

Actual behavior

• Keywords are displayed : "image, insa, ametys, cms"
• Click again on "Metadatas"
• Keywords are displayed : "image, insa, ametys, cms" with a third space

Expected behavior

• No additional space