docs: protected boolean isBaseEmpty() {
  		if (myUndeclaredExtensions != null) {
  			for (ExtensionDt next : myUndeclaredExtensions) {
  				if (next == null) {
  					continue;
  				}
  				if (!next.isEmpty()) {
  					return false;
  				}
  			}
  		}
  		if (myUndeclaredModifierExtensions != null) {
  			for (ExtensionDt next : myUndeclaredModifierExtensions) {
  				if (next == null) {
  					continue;
  				}
  				if (!next.isEmpty()) {
  					return false;
  				}
  			}
  		}
  		return true;
  	}