PVS-Studio warning V603 for google-breakpad

struct Expr {
  Expr(const UniqueString* ident, long offset, bool deref)
  {
    if (ident == ustr__empty()) {
      Expr();                            <<<<====
    } else {
      postfix_ = "";
      ident_ = ident;
      offset_ = offset;
      how_ = deref ? kExprSimpleMem : kExprSimple;
    }
  }

  Expr(string postfix) {
    if (postfix.empty()) {
      Expr();                            <<<<====
    } else {
      postfix_ = postfix;
      ident_ = NULL;
      offset_ = 0;
      how_ = kExprPostfix;
    }
  }

  Expr()
  {
    postfix_ = "";
    ident_ = NULL;
    offset_ = 0;
    how_ = kExprInvalid;
  }
  ....
};

This suspicious code was found in google-breakpad project by PVS-Studio static code analyzer.
Warning message is:
V603 The object was created but it is not being used. If you wish to call constructor, 'this->Expr::Expr(....)' should be used. module.h 146

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