fix/ demo grid.php

[ibelar]

model array access error

[codecov]

Codecov Report

Merging #1227 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1227   +/-   ##
==========================================
  Coverage      72.76%   72.76%           
  Complexity      2559     2559           
==========================================
  Files            130      130           
  Lines           6271     6271           
==========================================
  Hits            4563     4563           
  Misses          1708     1708           

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