LUT-28697 : Add missing import

Author: obfromevi

src/java/fr/paris/lutece/plugins/forms/web/admin/FormQuestionJspBean.java

@@ -40,6 +40,7 @@
 
 import javax.servlet.http.HttpServletRequest;
 
+import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.BooleanUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.math.NumberUtils;