[OFBIZ-10412] Remove `UtilValidate::isEmpty(String)` method

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Implemented
• Affects Version/s: Trunk
• Fix Version/s: 18.12.01
• Component/s: base
• Assignee: Jacques Le Roux
• Reporter: Mathieu Lirzin (Inactive)
• Created: 20/May/18 19:05
• Updated: 02/Aug/19 16:18
• Resolved: 24/May/18 13:36

Description

UtilValidate class contains a `isEmpty` method both for `CharSequence` and for `String` types but since the first is an interface for the other and that the implementation are the same we don't need to keep the one for the concrete type.

Additionnaly I have removed the unused Generic type for the remaining implementation.