I fixed it with a string pattern, the only change is to add {{row.entity[col.field]}}a default string to the pattern.
Here is the result:
rowTemplate: "<div><div ng-repeat=\"col in grid.renderedColumns track by $index\" class=\"ui-grid-cell col{{ col.index }}\"><div class=\"ui-grid-vertical-bar\"> </div><div class=\"ui-grid-inner-cell-contents\" ui-grid-cell=\"\" col=\"col\" row=\"row\" row-index=\"row.index\" col-index=\"col.colDef.index\">{{row.entity[col.field]}}</div></div>",
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