protected boolean tryFindConversionIfOperandIsNull(TypeView nullCandidate, TypeView comparingType, PsiExpression comparingExpr) {
    if (nullCandidate.getType() == PsiTypes.nullType() && comparingType.isChanged()) {
      Pair<PsiType, PsiType> typePair = comparingType.getTypePair();
      final TypeConversionDescriptorBase
        conversion = myLabeler.getRules().findConversion(typePair.getFirst(), typePair.getSecond(), null, comparingExpr, false, myLabeler);
      if (conversion != null) {
        myLabeler.setConversionMapping(comparingExpr, conversion);
      }
      return true;
    }
    return false;
  }
protected boolean tryFindConversionIfOperandIsNull(TypeView nullCandidate, TypeView comparingType, PsiExpression comparingExpr)