consolidate other validations

MacPass/MPOutlineViewController.m

@@ -158,29 +158,6 @@ NSString *const _MPOutlinveViewHeaderViewIdentifier = @"HeaderCell";
   return [[self.outlineView itemAtRow:row] representedObject];
 }
 
-#pragma mark Validation
-
-- (BOOL)validateMenuItem:(NSMenuItem *)menuItem {
-  MPActionType actionType = [MPActionHelper typeForAction:[menuItem action]];
-  switch(actionType) {
-    case MPActionAddEntry:
-    case MPActionAddGroup:
-    case MPActionDelete: {
-      MPDocument *document = [[self windowController] document];
-      id selected = [self _clickedOrSelectedGroup];
-      if(!selected) {
-        return NO;
-      }
-      if(selected == document.trash) {
-        return NO;
-      }
-      return ![document isItemTrashed:selected];
-    }
-    default:
-      return YES; // We are only validated for three targets
-  }
-}
-
 #pragma mark -
 #pragma mark Actions