fix for EXT-6999 Group creation panel: pop-up menu for empty group title...

fix for EXT-6999 Group creation panel: pop-up menu for empty group title editfield has 'Delete' item enabled
reviewed Mike Antipov
https://codereview.productengine.com/secondlife/r/307/

--HG--
branch : product-engine

indra/llui/lllineeditor.cpp

@@ -1440,7 +1440,7 @@ BOOL LLLineEditor::handleUnicodeCharHere(llwchar uni_char)
 
 BOOL LLLineEditor::canDoDelete() const
 {
-	return ( !mReadOnly && (!mPassDelete || (hasSelection() || (getCursor() < mText.length()))) );
+	return ( !mReadOnly && mText.length() > 0 && (!mPassDelete || (hasSelection() || (getCursor() < mText.length()))) );
 }
 
 void LLLineEditor::doDelete()