change error message when no key is entered
diff --git a/org.eclipse.babel.editor/src/org/eclipse/babel/editor/refactoring/RenameKeyProcessor.java b/org.eclipse.babel.editor/src/org/eclipse/babel/editor/refactoring/RenameKeyProcessor.java
index 9c21f6d..0b0e3e2 100644
--- a/org.eclipse.babel.editor/src/org/eclipse/babel/editor/refactoring/RenameKeyProcessor.java
+++ b/org.eclipse.babel.editor/src/org/eclipse/babel/editor/refactoring/RenameKeyProcessor.java
@@ -136,6 +136,9 @@
 	public RefactoringStatus validateNewElementName(String newName) {
 		Assert.isNotNull(newName);
 
+		if (newName.length() == 0) {
+        	return RefactoringStatus.createFatalErrorStatus("New name for key must be entered");
+		}
 		if (newName.startsWith(".")) {
         	return RefactoringStatus.createFatalErrorStatus("Key cannot start with a '.'");
 		}