[Dolibarr/dolibarr] c76edb: FIX avoid php warning

[Laurent Destailleur]

  Branch: refs/heads/11.0
  Home:   https://github.com/Dolibarr/dolibarr
  Commit: c76edb20d7f844b13c4c0ad7f5f5c646df978292
      
https://github.com/Dolibarr/dolibarr/commit/c76edb20d7f844b13c4c0ad7f5f5c646df978292
  Author: Regis Houssin <address@hidden>
  Date:   2019-12-27 (Fri, 27 Dec 2019)

  Changed paths:
    M htdocs/product/class/product.class.php

  Log Message:
  -----------
  FIX avoid php warning


  Commit: defe3b20ecebe0063aaee9a5fd770ed491a0a9f1
      
https://github.com/Dolibarr/dolibarr/commit/defe3b20ecebe0063aaee9a5fd770ed491a0a9f1
  Author: Laurent Destailleur <address@hidden>
  Date:   2019-12-30 (Mon, 30 Dec 2019)

  Changed paths:
    M htdocs/product/class/product.class.php

  Log Message:
  -----------
  Merge pull request #12764 from hregis/11.0_bug

FIX avoid php warning


Compare: 
https://github.com/Dolibarr/dolibarr/compare/8202a67e4ea4...defe3b20eceb